CH98443A - Telephone installation including a semi-automatic central office. - Google Patents

Description

  

  Telephone installation including a semi-automatic central office. The invention relates <B> to </B> a telephone installation comprising a semi-automatic central office, in which the connection between a calling line of <B> this </B> semi-automatic office and a called line belonging <B> to </B> a remote central office, is carried out under the control of a sending unit, the calling line being connected by an attendant <B> to </B> a <B> of </B> its cord circuits, while a series of junction circuits are arranged so <B> to </B> that each of them can be connected with that of the cord circuits of the position which received the call,

    in order to choose a free sending unit from a series of similar units. According to the invention, each of said junction circuits ends <B> to </B> a set of researcher switches making the connection with said cord circuit having received the call, so that it is connected, <B> to </B> through this junction circuit, <B> to </B> a senders selector looking for a free sending unit.



  Figs. <B> 1 to 16, </B> taken as a whole, show <B> to </B> by way of example one of the embodiments of the object of the invention. The order in which the drawings are to be considered is shown in fig. <B> 17. </B> The letters <B> <I> S </I> </B> and 3/1 designate respectively sensitive and marginal relays, while the letters <I> H and </I> L relate respectively <B> to </B> high and <B> to </B> bass re6stances. In these figures,

   schematically shows a central telephone office of the semi-automatic type equipped with the principles of the invention. We have considered the case where this office can communicate with remote offices, some of which are of the automatic type while others are of the manual type. Figs. <B> 5, 6 </B> and <B> 7 </B> relate <B> to </B> a remote manual central office while the other figures refer to the semi-automatic central office.

           These are the selectors. The selector switches employed in this installation are of the type to which the movement is imparted by a mechanical transmission, and are described in Swiss patent No. <B> 67181 </B> class -120 e. In order to distinguish the tins from the others the different selector switches used, the following designation has been adopted; district selector (fig. <B> 1); </B> desk selector (fig. 2); local arrival selector (fig. <B> 3); </B> final reader (fig. 4); and senders selector (fig. <B> 9). </B>



  Each of these selectors has a movable rod carrying brushes arranged in such a manner. <B> to </B> rub on a collector panel, thereby controlling the operation of the corresponding selector switch. Each rod also carries brushes arranged to be connected with the contacts of a terminal panel by means of which connections <B> to </B> lines leading <B> to </B> switches or <B> to </B> subscriber stations can be made. <B> A </B> With the exception of the sender selector, all selectors carry five sets of brushes, but only one of these sets is not shown in the drawings.

    The terminal panel of each of the district, office, arrival and final room selectors comprises five hundred rows of terminals divided into five sections of one hundred rows each. Each set of brushes is arranged to be able to connect each row of terminals of a certain section, and in the normal position remain below the first row of each respective section. In the rest position, the brushes of a set are kept away from the terminals by means of a cam, and an associated trigger device <B> to </B> each selector allows <B> to </B> any set of brooms to be liberated so <B> to </B> what these come in contact with the terminals of its res pective section.

   The trigger apparatus shown in the drawings is the same as that described in the aforementioned Swiss Patent No. <B> 67181. </B>



  The movable sender selector rod carries a single set of brushes, which are always free and normally remain on the lowest row of the terminal panel. Coîîèbinezirs. The combiners used in the present invention, <B> to </B> except the combiner <B> 300, </B> are set in motion by a pulley <B> to </B> friction rotating continuously. Combi- iieurs <B> 10, 100> 150 </B> and 200 respectively control, by means of their contacts, the circuits of the district, office, arrival and final selectors.

   The combiner <B> 900 </B> controls the circuits of an operator's key table; the combiner <B> 500 </B> controls the circuits of a series of recorders; the combiner <B> 700 </B> controls the circuits of a sender; and the combir) eur <B> 800 </B> also controls the operation of the sender and is hereafter referred to as the class recorder.



  The combiner <B> 300 </B> is practically of the same construction as the previous combiners, except that its setting in motion is obtained by <B> to </B> not by an electromagnet and any arrangement of ratchets and pawls.



  The construction of each of the cord finders <B> A </B> and B and distributor 400 is similar <B> to </B> that described in Swiss patent No <B> 67181. </B>



  Roof the serial contacts shown in fig. <B> 1, </B> 2, <B> 3, </B> 4, <B> 6, 9, 11, </B> 12, <B> 13 </B> and <B> 1-i </B> are controlled by the respective combiners shown in the corresponding figures.

   Contacts of Cordon researchers <B> A, </B> <I> and B </I> are shown respectively <B> to </B> left and <B> to </B> right of the vertical dotted line in fig. <B> 8. </B> The contacts controlled by the distributor 400 are included in the dotted square in fig. <B> 8. </B> <I> Table of <B> keys. </B> </I> The operator's key table is shown in fig. <B> 10 </B> and <B> 11. </B> When a <B> key </B> is lowered in any one of the rows, it is blocked by a mechanical device which can be released following the lowering of another key <B> of </B> the same row,

    or as a result of the excitation of the electromagnet <B> 601. </B> A similar electromagnet is provided for each row of keys. he <B> y </B> has eight rows of keys which are designated below <B> '3 </B> ZD <B> the </B> names of rows of office keys, hundreds in tandem, tens in tandem, units in tandem, (these first four rows being shown in fig. <B> 10 </B> respectively left <B> to </B> each right below an electromagnet <B> 601) </B> thousands, hundreds,

   units and stations (these last four rows being shown in fig. <B> He </B> and including the keys respectively <B> 670, </B> 666., <B> 679 </B> and <B> 683). </B> Each of these rows, <B> to </B> except for office and station keys, includes keys numbered zero <B> to </B> nine, and each of these commands as many contacts as there are <B> judged </B> necessary to get the selectors and recorders to work. The number of office and station keys depends on the traffic required.

   Office keys are the equivalents of tandem hundreds, tandem tens, tandem units and stations, that is, lowering one <B> key </B> of offices equals <B> to </B> A key combination of tandem hundreds, tandem tens, tandem units and stations. The office keys are provided to control the connection of trunk lines leading <B> to </B> large offices, slums that other offices can be reached by lowering a combination (the tandem keys and stations. E, aregisireurs.



  Figs. 14, <B> 15 </B> and <B> 16 </B> represent ten registrars. These are referred to as <B>: </B> class recorders; of districts; groups of districts; office balconies; groups of offices; arrival brushes, <B> of </B> arrival and final broom groups; final tens; final units, and stations. <B> A </B> Except for the class recorder, each recorder has three relays including deur, marginals and a sensitive. Each of the logger relays is provided with a blocking circuit and the operation of the sending unit depends on <B> d </B> the condition of the relays of a given recorder. Traduelion.



  The arrangement of the auxiliary line terminals on the district and office selector panels depends on the traffic required, assuming in the present case that the arrival selector shown in fig. <B> 3 </B> is accessible, lowering the office key <B> A </B> determines the tripping of the third set of district selector relays, and its advancement <B> to </B> not to the ninth group <B> of </B> terminals of the third section of the panel. Then the release of the second set of brushes <B> of </B> office selector and its progress not <B> to </B> not to the first group of terminals of the second section of the panel of this selector, occurs.



  It was assumed that the semi-automatic desktop included in the installation shown <B> to </B> As an example, small serving ten thousand subscribers. If the called line is part of an automatic central office, it is reached by the local arrival and final selector switches <B> to </B> each of which results in five hundred lines.

   If we assume that the number of the requested line is 8456, it is necessary with the types of switches described above, to trigger the second set of brushes of the incoming local selector, which has access <B> to </B> connecting lines leading <B> to </B> a group of final selectors, containing the numbered lines of 2000 <B> to 3999. </B> The second set of brushes is then set in motion and comes into contact with the third group of terminals served by this set of brushes. The junction lines which end in this group lead <B> to </B> final selectors having access <B> to </B> lines numbered with <B> 3000 to </B> .3499. The local arrival selector then comes into action to choose a free trunk line in this group.

    In the final selector associated with the * free junction line chosen, it is necessary to unplug the fifth set of brushes giving access to the lines numbered 3400 <B> to </B> 3499. The fifth set of final selector brushes then takes position under the sixth group <B> of </B> terminals in which are included lines numbered 3450 <B> to </B> 3459. The final selector brushes are finally brought into contact with the seventh set of terminals of the sixth group, thus completing the connection with the requested line.

        If the called line is part of a manual central office, it is reached by district and office selectors, <B>, </B> which connect a trunk line leading directly from the district selector to the manual office. A call indicator from this office then works <B> - </B> in the well-known manner, in order to inform the operator of this manual office of the number of the line called.

           01) operations. In general, the operations of the semi-automatic central office devices included in the installation are as follows: <B>: </B> First, take the case of a subscriber of this semi-automatic office calling a subscriber of a remote automatic central office.



  In fig. <B> 1 </B> is indicated <B> to </B> left a subscriber set <B> 1 </B> whose line ends at the considered semi-automatic central office. This line ends in the <B> jack 5 </B> an operator position, including the circuit <B> of </B> cor don is shown in fig. <B> 1. </B> The position of this operator is not indicated on the figure but it is connected to the cord circuit shown, by the armatures of relay 14. An operator position has several similar cord circuits <B> to </B> the one shown, but only one of these has been indicated.

   The cord circuit of fig. <B> 1 </B> abou tit on the one hand <B> to </B> answer sheet 4, and on the other hand <B> to </B> a district selector indicated by its 74 electromagnets, <B> 28 </B> and <B> 65, </B> and by its brooms 44 <B> to </B> 46. The contacts of this coi-don circuit are controlled by the combiner <B> 10. </B> During a call, as soon as the operator has inserted form 4 in the <B> jack 5 </B> of the calling line, the combiner <B> 10 </B> is put into action and connects <B> to </B> a distributor 400 (fig. <B> 8) </B> which controls a group of junction circuits, so named because they serve <B> of </B> junction, during Lin call,

   between the operator position and a sender selector, as explained below. One of these junction circuits is shown in Figs. <B> 8 </B> and <B> 9, </B> and it ends on the one hand <B> to </B> a senders selector, shown <B> to </B> right of fig. <B> 9 </B> by its electromagnets 914 and <B> 979, </B> and by its brooms <B> 912, 955, 967, </B> 941, 949 and 945, and on the other hand <B> to </B> researchers <B> A </B> <I> and B </I> (fig. <B> 8) </B> having access <B> a </B> the key table for the operator position. These researchers are operated by combiners 425 and 450 respectively.

   The cord circuits of an operator position can be served by a series of trunk circuits such as the one shown. <B> A </B> this effect, <B> the </B> distributor 400 orders a series of springs such as the row comprising the springs <U> 409 </U> and 405, at the contacts of which the ends of the junction circuits end.

   Considering in particular the play circuit shown, the control circuit of the combiner 425 ends at contact 4 of the res out 402, while the control circuit of the combiner 450 ends at the contact 4 of the placed spring. <B> to </B> right of spring 405. So the lower horizontal series of three spells, <B> to </B> which belong the springs 402 and 405, dessert <B> the </B> junction circuit shown. Uri another junction circuit leads <B> to </B> the second horizontal row of springs, and so on.

   The operator position comprises twenty-four cord circuits, twelve of which terminate at the left springs of the horizontal rows while the other twelve cord circuits terminate at the right springs of these horizontal rows. We can therefore see that researcher .1 is part of a set of researchers, <B> ap- </B> starting <B> to </B> different junction circuits, which have access <B> to </B> twelve horn circuits from the operator position, while researcher B belongs <B> to </B> a group of researchers, belonging <B> to </B> different junction circuits <B>., </B> which have access to the twelve. other bead circuits in the position.

   When the two searchers of a junction circuit are free, the distributor 400 closes the corresponding contacts, and if a cord circuit comes <B> to </B> receive a call, it is immediately connected <B> to </B> the key table by the junction circuit whose contacts are closed. For example, if the junction circuit shown is free, that is to say if its two searchers are free, the contacts 4, of the springs of the lower row of springs, are closed.

   If a call is served by one of the first twelve cord circuits in the attendant position, it is connected <B> to </B> the table of keys by the junction circuit considered and the researcher <B> A. </B> If, on the contrary, the call is served by one of the twelve other cord circuits of the position, this one is connected <B> to </B> the table of <B> keys </B> by the junction circuit considered and the researcher B.



  he <B> y </B> has only one key table per operator position, and the table of the position shown in the drawing is shown in figs. <B> 10 </B> and <B> 11. </B> The combiner <B> 900 </B> of the junction circuit, links the key table to the senders selector which chooses a free sending unit. When the attendant has lowered the keys corresponding to the digits of the number <B> - </B> from the subscriber <B> 1, </B> the recorders of the sending unit are then moved according to these keys. The circuits of these recorders are controlled by a combiner <B> 500 </B> shown in fig. 12.

   The class recorder, shown in fig. 14, is first operated according to the gender <B> of </B> office to which the called subscriber belongs, then successively the following recorders are activated <B>: </B> District bay recorder shown in fig. <B> 15 </B> by the releases <B> 531, 533 </B> and <B> 532; </B> District group recorder shown in fig. <B> 15 </B> by Releases 540, 541 and 542;

   office brush recorder shown in fig. <B> 15 </B> by relays 549, 550 and <B> 551; </B> office group recorder shown in fig. <B> 15 </B> by relays 554, 547 and <B> 553; </B> arrival brush recorder shown in fig. <B> 16 </B> by the relays <B> 561, 562 </B> and 564;

   recorder of arrival and final brushes shown in fig. <B> 16 </B> by relays 5îl, <B> 572 </B> and <B> 573; </B> final recorder of the tens represented in fig. <B> 16 </B> by the relays <B> 577, </B> <B> 578 </B> and <B> 579; </B> final unit recorder shown in fig. <B> 16 </B> by the relays <B> 583, </B> 584 and 585;

      and recorder <B> of </B> stations shown in fig. <B> 16 </B> by the relays <B> 587, 588 </B> and <B> 590. </B> The counter relays shown in fig. <B> 18 </B> are then energized according to the operation of the previous recorders, and their circuits are controlled by the combiner <B> 700. </B> Under the control of these counting relays, the district selector in fig. <B> 1 </B> connects <B> to </B> a desk selector shown in fig. 2 by its 135 electromagnets, <B> 109 </B> and <B> 119, </B> and by its brooms <B> 125,

   </B> 124 and <B> 123. </B> This office selector then connects <B> to </B> a local arrival selector shown in fig. <B> 3 </B> by its electromagnets 147, <B> 162 </B> and <B> 170, </B> and by its brooms <B> 182, 185 </B> and <B> 177. </B> This local arrival selector finally connects a final selector which is shown in fig. 4 by its 211 electromagnets, <B> 225, </B> 240 and 220, and by its brushes <B> 230, 229 </B> and <B> 228. </B> This selector <B> fi- </B> nal searches for and connects a free line going to the remote automatic office to which the called subscriber belongs. In fig. 4, 201 shows the set of this called subscriber which is therefore served by said remote automatic office.



  In the event that a subscriber of the semi-automatic central office wishes to speak with a subscriber of a remote manual central office, the latter is reached by trunk lines arriving directly. <B> to </B> a district selector instead of going through an office selector. The operator still forms the number requested on her keys table, but she lowers a <B> key </B> release different from that used previously. The district selector is then controlled by the sender so <B> to </B> choose a free junction line leading to the desired manual central office.

   When the operator of this office responds by lowering a key, current pulses are sent in accordance with <B> to </B> the operation of the recorders of fig. <B> 15 </B> and <B> 16 </B> to activate a call indicator <B> to </B> this manual office, so that the number of the requested line is visibly indicated <B> to </B> the position of the operator of the manual desk. This operator then completes the desired connection. This indicator and some circuits of the position of this operator from the manual desk are shown in figs. <B> <I> 5, </I> 6 </B> and <B> 7. </B>



  The following detailed description of the operations of the installation gives a better understanding of the installation. <I> Case of a subscriber says </I> biii-water <I> central </I> seini-autoinatique <i> wishing </I> _pai-lew <I> with a subscriber </I> from ioi biti-eau central auloinatique saying. The station subscriber <B> 1 </B> wishing to obtain a communication with Lin subscriber p'acé <B> to </B> station 201, fig. 4, an automatic central office,

      removes its receiver from the switch hook, thus energizing the line relay C) and causing the calling lamp to come on <B> 3. </B> The operator inserts form 4 in the. jack <B> 5 </B> correspondent <B> to </B> the calling line, and a circuit is closed passing through the ground, the battery, the pure neck relay winding <B> 6, </B> the cannon of <B> jack 5, the </B> barrel of file 4, Relay winding <B> 7, </B> and reads earth. Relay <B> 6 </B> being energized, open the circuit of relay 2, and the lamp <B> 3 </B> goes out.

   Relay <B> 7 </B> close <B> the </B> next circuit <B>: </B> earth, battery, armature and <B> the </B> contact <B> of </B> key relay rest <B> 8, </B> resistance <B> 9, </B> Relay winding <B> 11, </B> the lower serial contact 12, Parmature on the right and the relay contact <B> 7, </B> the drivers <B> 9-7 </B> and <B> 13, </B> the lower serial contact 14, and the earth. Relay <B> He </B> is excited and closes a circuit passing through the earth, the battery, the relay winding <B> 15, </B> the right-hand man and the contact <B> of </B> relay work <B> 11, </B> and the earth.

   Relay <B> 15 </B> close <B> to </B> evening tour the following circuit <B>: </B> the earth, the battery, Peletro-magnet motor of the combiner <B> 10, </B> the lower left serial con tact <B> 16, </B> Right exterior frame and the relay working contact <B> 15, </B> the driver <B> 17, </B> the lower left serial contact <B> 18, </B> and earth, which results in moving the combiner <B> 10 of his </B> first <B> to </B> its second position.

    As soon as the combiner has left its first position, a blocking circuit for the relay <B> 11 </B> is formed as follows <B> - </B> the earth, the bat terie, Parmature and the rest contact of the relay <B> 8, </B> resistance <B> 9, </B> Relay winding <B> 11, </B> Left inner frame and the relay contact <B> 11, </B> the winding of relay 14, and the earth. Relay 14 is energized and connects the Operator set not shown in the drawing with the calling line.



  For the second position of the combiner <B> 10, </B> the following circuit is completed <B>: </B> the earth, the battery, the electromagnet motor of the 425 coni- nator of the circuit finder <B> of </B> horn donation <B> A </B> which has access to the group of cheuits including the one shown in the drawing, serial contacts 426 and <B> 901, </B> the conductor-902, the contact 451 of the conibiner 450 of the bead circuit finder B, the conductor 401, the lower left contact 402 of the distributor 400,

   the 403 driver, the right serial con tact <B> 16, </B> Right exterior frame and the relay working contact <B> 15, </B> the driver <B> 17, </B> the lower serial contact <B> 18, </B> and the earth. The combiner 425 then switches from its seventeenth <B> to </B> its eighteenth position.



  It should be observed that the circuit of the 4,25 ri * combinator is not closed, so that the two searchers of bead circuits associated with the free junction circuit chosen are not themselves free, that is to say n do not occupy their seventeenth position. In addition, the other circuit seekers having access to the circuit shown in FIG. <B> 1, </B> cannot leave their seventeenth position, because the circuits of these researchers are open to distributor 400.

   Likewise, finder B combiner 450 also remains in its seventeenth position, since its circuit is or green in contact with spring 440. Distributor 400 has five positions and is designated to provide a different junction circuit in each of its positions one, two and four. The third position is a free position, and therefore the earth is connected to the lower contact of the spring 408 so that the valve moves to this position without stopping. Position five is a standby position in which the distributor remains if all junction circuits are occupied.

   As soon as one of them becomes free, a circuit is closed <B> of </B> the manner described above, and the distributor leaves its fifth position and comes to occupy the position for which a junction circuit is free.



  For the eighteenth position of coinbiter 425, the following circuit is closed <B>; </B> earth, battery, left winding of the relay <B> 003, </B> the conductor 904, the serial contact 005, the conductor <B> 906, </B> the left-hand contact of the serial spring 427, and the earth. Relay <B> 903 </B> being excited, complete a circuit passing through the earth, the battery, the electric motor <B> of </B> combiner <B> 900, </B> the lower left contact of the serial spring <B> 907, </B> the driver <B> 908, </B> the left frame and the contact <B> of </B> relay work <B> 903, </B> and the earth.

    The combiner <B> 900 </B> then passes from its first <B> to </B> his third position.



  If the corresponding sender <B> to </B> the lowest terminal set of the selector, with which the brushes of the latter device are normally engaged, is occupied, relays it <B> 903 </B> closes its own blocking circuit which includes <B>: </B> the earth, the battery, the right winding of the relay <B> 903, </B> the top serial contact <B> 909, </B> the armature of, right and the working contact of the relay <B> 903, </B> the upper right serial con tact <B> 910, </B> resistance <B> 911, on </B> broom <B> 912, </B> the terminal <B> 913, </B> and the earth <B> to </B> through serial contact <B> 953 </B> from another sending selector.

   So when the combinator <B> 900 </B> reached its third position, the re lais <B> 903 </B> remains excited and completes a circuit passing through the earth, the battery, the winding of the vertical motor electromagnet 914, the lower right serial contact <B> 915, </B> the driver <B> 908, </B> the left armature and the contact of the relay <B> 903, </B> and the earth. Under the control of the solenoid 914, the brush holder shaft <B> 916 </B> of the selector is <B> de- </B> upwards until the test broom <B> 912 </B> come into contact with the test terminal <B> 913 </B> connected <B> to </B> a free sender.

    If the sender is free, no land is connected <B> to </B> the test terminal <B> 913. </B> The relay <B> 903 </B> remains excited until the selector arms are exactly centered on the terminals of this free sender as a result of the following circuit: earth, battery, left winding <B> of </B> relay <B> 903, </B> driver 904, the top serial contact <B> 917, </B> the conductive segments of the switch <B> 918, </B> the broom <B> 919, </B> the top serial contact <B> 915, </B> the driver <B> 908, </B> the left armature and the contact of the relay <B> 903, </B> and the earth.

   As soon as the selector brushes have been read on the corresponding terminals of a free sender, the brush <B> 919 </B> comes into contact with an insulating segment of the switch <B> 918 </B> thus causing the neutralization of the relay <B> 903. </B> A circuit is then closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the driver <B> 920, </B> the left serial contact <B> 921, </B> Left hand side and the rest contact of the relay <B> 903, </B> and the earth. The combiner <B> 900 </B> thus passes from his third <B> to </B> his fifth position.



  When the combiner <B> 900 </B> reaches its third position, a circuit is also closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner 425, the upper right serial contact 426, the conductor 434, the upper right serial contact <B> 923, </B> Par- mature inner left and contact <B> dice </B> relay 924 rest, and earth. Combi- neur 425 passes from his eighteenth <B> to </B> its fifth position for which the cord circuit shown in fig. <B> 1 </B> is connected to the sending se reader.

   In each of the positions a <B> to </B> Twelve inclusive of the 425 combiner, a different cord circuit is connected to the selector.



  When combiner 425 reaches position 4/4, a circuit is completed from earth through the battery, the resistor <B> 925, </B> the top serial contact <B> 926, </B> the driver <B> 927, </B> the lower left contact 405, the conductor 406, the right armature and the working contact of the relay <B> 15, </B> the driver <B> 23, </B> the lower right serial contact 24, the conductor 430, the upper serial contact 421, the conductor <B> 928, </B> the top serial contact <B> 929, </B> the right winding of relay 924, and earth.

   Relay 924 being energized opens the circuit traced above for combiner 425 which stops as soon as it reaches its fifth position. Relay 924 closes the following circuit: earth, battery, relay winding <B> 930, </B> the lower right serial contact <B> 931, </B> the inner right armature and the working contact of relay 924, and the earth.

   Relay <B> 930 </B> is excited and closes the following circuit: the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the driver <B> 920, </B> the upper left serial contact <B> 932, </B> the right armature and the relay work contact <B> 930, </B> and the earth. The combiner <B> 900 </B> from his fifth <B> to </B> his seventh position.

   While this combi- iieur goes from his fifth <B> to </B> its sixth position, relay 924 is kept energized <B> to </B> through the following circuit <B> - </B> the earth, the battery, the left winding of relay 924, the left armature and the work contact <B> of </B> this relay, the driver <B> 933, </B> the upper left serial con tact 934, the inner left armor and the relay working contact <B> 930, </B> the driver <B> 935, </B> the upper serial contact 428, the driver <B> 37, </B> the lower serial contact <B> of </B> left <B> 25, </B> and the earth.

   When the combiner <B> 900 </B> from his sixth <B> to </B> its seventh position, the re lais 924 is kept excited on <B> the </B> following circuit: the earth, the battery, the left winding of relay 924, the left armature and the contact of this relay, the lower serial contact on the right <B> 929, </B> the driver <B> 928, </B> the upper serial contact 421, the conductor 430, the lower right serial contact 24, <B> the </B> driver <B> 23, </B> the inner right armature and the relay contact <B> 15, </B> the driver 406, the lower left contact 405, the driver <B> 927, </B> the lower serial contact <B> 926, </B> and the earth.



  When the combiner <B> 900 </B> reaches its position <B> 5 </B> 3/4, the following circuit is closed: the earth, the battery, the right serial contact 60la (fig. <B> 11), </B> the winding of the relay <B> 602, </B> the driver <B> 603, </B> the relay winding <B> 937, </B> the driver <B> 938, </B> the top serial contact <B> 931, </B> Inner ai-mature and working contact of relay 924, and earth.

   The relays <B> 602 </B> and <B> 937 </B> are excited and close their own blocking circuit <B>: </B> the earth, the battery, <B> the </B> left serial contact 60111, left armature and relay contact <B> 602, </B> while running this relay, the driver <B> 603, </B> the relay winding <B> 937, </B> the right frame and the working contact. this relay, the upper left serial contact <B> 939, </B> and the earth. Relay <B> 937 </B> connects the operator's key table <B> to </B> the free sender chosen and connected by the selector.

   After establishing the cord circuit finder <B> To </B> and the sender selector, the combiners occupy the following positions <B>: </B> the combi- rator <B> 10 </B> is in its second position, the combiner 425 is in its fifth position, the distributor 400 is in its fourth position, the combiner <B> 900 </B> is in its seventh position, and all other combiners in their first position.

       <I> Case in </I> leqîiel <I> the </I> seleciew <I> from researchers </I> <I> cords the sender selector does not </I> peui <I> operate normally. </I>



  If the sender selector in fig. <B> 9 </B> cannot find one. free sender, he comes to occupy his emergency position, and <B> to </B> this moment his brushes are not cry contact with the terminals of the senders. Likewise, the broom had to switch <B> 919 </B> is not in contact with the switch <B> 918, </B> but is with the emergency contact <B> 976. </B> The combiner <B> 900 </B> moves into its fifth position in the manner described.

   However, relay 924 is not energized when the finder-finder combiner 425 reaches its 4 P / 4 position. <B> to </B> cause of a closed shunt circuit around the right winding of the relay and including the conductor <B> 977, </B> the emergency contact <B> 976, </B> the broom <B> 919, </B> the lower left serial contact <B> 953, </B> and the earth. Relay contacts 924 remain in their normal position, and combiner 425 continues to rotate until it reaches its sixth position.

     <B> A </B> this moment a circuit is closed as follows <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the driver <B> 920, </B> the upper left serial contact <B> 932, on </B> driver <B> 978, </B> the lower serial contact 427, and the earth. The combiner <B> 900 </B> from his fifth <B> to </B> his seventh position. The next fired circuit is then closed <B>: </B> the earth, the bat terie, the motor electromagnet of the combiner 900; the driver -920, the lower serial contact <B> 923, </B> the right inner frame and the rest contact <B> had to </B> relay 924, and earth.

   This allows the combiner <B> 900 </B> to continue its movement up to its fifteenth position, for which the following circuit is completed: earth, -the battery, the electromagnetic motor of the combiner 425, the upper left serial contact 426, conductor 431, the upper left serial contact <B> 923, </B> the inner right armature and the normally-open contact of relay 924, and the earth,

    which brings the combiner 425 to its sixteenth <B> to </B> its seventeenth position which is its normal position. <B> A </B> this moment, the following circuit is closed <B>: </B> the earth, the battery, the electromagnet motor of the combination <B> 900, </B> the coupler <B> 920, </B> the upper right serial contact <B> 932, </B> the driver <B> 972, </B> the lower right 4052 and upper 427 serial contacts, and Io, earth. The combiner <B> 900 </B> then goes from 'his fifteenth <B> to, </B> his sixteenth position.

    For this, the following circuit is closed <B>: </B> the earth, the battery., The winding of the vertical motor electromagnet <B> 979, </B> the lower right s6- sial contact <B> 953, </B> and the earth. Under the key command this electromagnet <B> 979, </B> the sender selector is returned to idle.

    When the broom <B> 919 </B> reaches its normal position, a circuit is completed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the lower right serial contact <B> 907, </B> the normal driver segment <B> 975, </B> the broom <B> 919, </B> the lower left serial contact <B> 953 </B> and the earth. The combiner <B> 900 </B> then leaves its sixteenth position and takes its first position.



  When the combiner <B> 900 </B> reaches its thirteenth position, the following circuit is closed. earth, battery, distributor motor electromagnet 400, upper contact 408, conductor 417, upper right and lower serial contacts <B> of </B> left <B> 962, </B> and the earth. The distributor moves to another position <B> to </B> looking for a free junction line. This operation of the distributor is more fully described below. The devices associated with the new chosen junction circuit are then actuated to establish the requested connection in exactly the same way as in the previous case.

      If the cord finder cannot operate normally, that is, if relay 924 is not energized when the cord finder reaches the desired position to connect the cord circuit designated by the sender selector, the combiner 42.5 continues to spin until it reaches its sixteenth position. <B> A </B> At this moment, the circuits traced above are closed in the manner <B> already </B> described, which restores the dear cheur and the sender selector <B> to </B> the normal position, while a new finder scope and a new selector are set in motion.



  It should be observed that if the cord finder or the senders selector cannot operate normally, relay 924 is not energized, and <B> the </B> relay <B> 937 </B> which connects the key table <B> of </B> the operator at the sender selector is not receiving current. One of the results of this arrangement is therefore that the key circuit is in no case affected under the assumed conditions. <I> Adjustment of the </I> lable <I> keys. </I>



  Assuming that the number of the called subscriber is <B> A 3456, </B> the operator lowers the <B> key </B> offices <B> A, </B> the third, fourth, fifth and sixth keys respectively of the rows of miles, hundreds, tens and ones, and the starting key <B> 667, </B> by which the lowered keys are blocked.



  As a result of the lowering of key -4, contacts 604, 605Y <B> 606 </B> and <B> 607 </B> are closed and a circuit is completed as follows <B>: </B> the earth, the battery, the windings <B> of </B> relay right <B> 608 </B> and <B> 609, </B> the driver <B> 610, </B> contact 604, the driver <B> 611, </B> the right bearing of the relay <B> 612, </B> and the earth. The relays <B> 608, 609 </B> and <B> 612 </B> are excited. A second circuit is formed <B>. </B> the earth, the battery, the windings of the relays <B> 616 </B> and <B> 617, </B> drivers <B> 6.18 </B> and <B> 619, </B> contact <B> 605, </B> the driver <B> 620, </B> the windings of the relays <B> 621 </B> and <B> 622, </B> and the earth. The relays <B> 616, </B> <B> 617, 621 </B> and <B> 622 </B> are excited.

   A third c circuit is completed <B> to </B> through earth, battery, relay windings <B> 623 </B> and 624, the driver <B> 625, </B> contact <B> 606, - </B> the windings of the relays <B> 626 </B> and <B> 627, </B> and the earth. The relays <B> 623, </B> 624, <B> 626 </B> and <B> 627 </B> are excited.

   A fourth circuit is closed <B> to </B> through earth, battery, resistance <B> 628, </B> the driver <B> 629, </B> contact <B> 607, </B> the driver <B> 630, </B> the windings of the relays <B> 631 </B> and <B> 623, </B> and the earth, which excites the re lais <B> 631. </B> The excitement of the relays <B> 608 </B> and <B> 609 </B> determine the closure of a circuit passing through the earth, the battery, the motor electromagnet of the combitieur600 (fig. <B> 11), </B> the upper left serial contact <B> 613, </B> the conductor 614, the external fittings and the working contacts of the relays <B> 608 </B> and <B> 609 </B> in parallel, the conductor 6lâ, the right armature and the working contact of the relay <B> 602, </B> and the earth.

    The combiner <B> 600 </B> then passes from its first <B> to </B> its second position.



   <I> Operation of the class recorder. </I> As soon as the combiner <B> 600 </B> reaches its position <B> 13/1, </B> the following circuit closes <B>: </B> earth, battery, relatively low resistance <B> 632 </B> (fig. <B> <I> 10), </I> the </B> driver <B> 1633, </B> the mature ar right and contact durelais <B> 612, </B> driver 634, the lower left serial contact <B> 635, </B> the driver <B> 636, </B> the external left armor and the relay working contact <B> 937, </B> the conductor 940, the brush 941, the terminal 942, the conductors 943 and <B> 501, </B> the serial contact] upper left <B> 502, </B> conductor 503, the right winding of the marginal relay <B> 801,

   </B> the right-hand winding of the sensitive relay <B> 802, </B> and the earth. Due to the low resistance of this fired cii, the two relays <B> 801 </B> and <B> 802 </B> are excited.



  For the position <B> 1 </B> '/ 4 of the combiner <B> 600, </B> a circuit is made passing through the earth, the battery, the right windings of the 804 and marginal sensitive relays <B> 805 </B> (fig. 14), the conductor <B> 806, </B> the serial contact] lower right <B> 507, </B> the driver <B> 508, </B> the terminal 944, the brush 945, the conductor 946, the inner left armature and the make contact <B> of </B> relay <B> 937, the </B> driver 947, <B> the </B> upper right serial contact 640, and conductor 641. Since the relays <B> 608 </B> and <B> 609 </B> are energized, this last circuit is open to the middle arrays and to the rest contacts of these relays.

   As soon as the combiner <B> 600 </B> reaches its second position, a circuit is closed <B> to </B> through earth, the right armature and the normally-open contact of relay 643, the two series windings of relay 644, the lower serial contact 646, conductor 647, the middle armature on the left and the relay working contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> drivers <B> 951 </B> and <B> 808, </B> the right winding of the marginal relay <B> 809, </B> the driver <B> 810, </B> the upper left serial contact <B> 509, </B> the relay winding <B> 510, </B> the battery, and the earth.

   The resistance of the two series windings of relay 644 is large enough to prevent excitation. <B> of </B> marginal relay <B> 809, </B> while the relays <B> 510 </B> and 644 are excited. The energization of this second relay breaks the sbunt passing through the left rest contacts of relays 643 and 644 and placed around the winding of relay 643, which results in energizing this relay by the current. passing <B> to </B> through the following circuit: earth, battery, resistor 648, the left serial contact <B> 697, </B> the winding of relay 643, and the earth. However, relay 644 remains energized as a result of the blocking circuit passing through its left armature and its make contact.



  Relay <B> 510 </B> closes a circuit passing through the earth, <B> 1.9. </B> battery, winding delay <B> 511, the </B> left serial contact <B> 512, </B> the driver <B> 513, </B> the left armature and relay working contact <B> 51.0, </B> the conductor 514, the armature and the rest contact of the relay <B> 515, </B> senior serial contacts <B> 516, </B> the armature and the rest contact of the relay <B> 517, </B> the driver <B> 518, </B> the serial contact <B> 519, </B> and the earth.

   Relay <B> 511 </B> is excited and closes its own blocking circuit not healthy by the earth, the battery, the relay winding <B> 511, </B> the left armature and the working contact of this relay, the conductor 520, the terminal <B> 913, </B> the broom <B> 912, </B> resistance <B> 911, </B> the higher serial contact 953, and the land.



  Relay <B> 511 </B> also closes a circuit passing through the earth, the battery., The motor electromagnet of the combiner <B> 500, </B> the lower left serial contact <B> 521, </B> the right armature and the working contact of the relay <B> 511, </B> and the earth. The combiner <B> 500 </B> from its first <B> to </B> its second position.

   When this combiner reaches the position <B> 1 </B> 3/4, a blocking circuit is closed for the relays <B> 801 </B> and <B> 802 to </B> through earth, battery, left winding of relay <B> 801, </B> the left mature ar and the working contact of this relay, in parallel with the left winding of the relay <B> 802, </B> the left armature and the working contact of this relay, the conductors <B> 816 and '026, </B> the lower left serial contact <B> 527, </B> and the earth.



  For the second position of the combiner <B> 500, </B> a circuit is closed- <B> to </B> through the earth, the battery, the electromagnet motor of the combination <B> 600, </B> the driver <B> 522, </B> the armature and the rest contact of the relay <B> 523, </B> the upper left and lower right serial contacts 524, the armature and the working contact of the relay <B> 510, </B> the driver 514, the mature ar and the rest contact of the relay <B> 515, </B> senior serial contacts <B> 516, </B> arming and rest contact of the relay <B> 517, </B> the driver <B> 518,

   </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> then leaves his second position and comes to occupy his third position, As soon as the combiner <B> 500 </B> reaches its 23/4 position, a circuit is closed to bring the combiner <B> 800 </B> of the class recorder in the position determined by the condition of the relays <B> 801, 802, </B> 804, <B> 805 </B> and <B> 809. </B> Assuming that the combiner was left in its thirteenth position, like the relays <B> 801 </B> and 802 are only excited <B> to </B> this moment,

   the combiner <B> 800 </B> moves in its twelfth position as follows <B>: </B> A circuit is closed <B> to </B> through the earth, the -battery, the motor electromagnet of the combiner <B> 800, </B> the upper right serial contact -814, the right armature 'and the working contact of the relay <B> 801, </B> the driver <B> 812, </B> the left serial contact <B> 525, </B> and the earth, which brings the combiner <B> 800 </B> in its first position.

   The following circuit is then closed <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 800, </B> the serial contact on the right 813, the armature on the right and the rest contact of the relay <B> 809, </B> the driver <B> 812, </B> the left serial contact <B> 525, </B> and the earth, which brings the combiner <B> 800 </B> in its tenth position.

   A circuit then closes <B> to </B> through the earth, the battery, the electromagnet motor of the combiner <B> 800, </B> the lower right serial contact <B> 815, </B> the right armature and the rest contact of relay 804, conductor 812 ,. the left serial contact <B> 525, </B> and earth, which brings the combiner of its tenth <B> to </B> his twelfth position. For this last position, no circuit is closed for the motor electromagnet of the combiner <B> 800. </B>



  When the combiner <B> 500 </B> leaves its second position, the circuit described above for the relays <B> 510 </B> and 644 is open, and these relays are disabled. Relay 644 completes the circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 600, </B> the lower right serial contact <B> 698, </B> the outer frame. <B> of </B> right and the rest contact of relay 649, the left armature and the working contact of relay 643, the left rear and the rest contact of relay 644, and earth.

   The combiner <B> 600 </B> from his second <B> to </B> his third position, and as soon as he leaves his second positioni relay 643 is neutralized.



       Man work <I> from the districts broom recorder. </I> When combiners <B> 600 </B> and <B> 500 </B> reach position 2 3 / & 1 a circuit is closed <B> to </B> through earth, battery, relatively high resistance <B> 699, </B> the driver <B> 650, </B> the armature and the working contact of the relay <B> 617, </B> the driver <B> 665, </B> the lower right serial contact <B> 651, </B> the conductor 647, the middle armature on the left and the working contact of the relay <B> 937, </B> the driver.

       948 # the broom 949, the terminal <B> 9U, </B> drivers <B> 951 </B> and <B> 528, </B> the lower right serial contact <B> 529, </B> the driver <B> 530, </B> the right-hand windings of the sensitive relays <B> 531 </B> and marginal <B> 532, </B> and the earth. Like high strength <B> 699 </B> is included in this circuit, only the relay <B> 531 </B> is excited and closes its blocking circuit <B> to </B> through the driver <B> 763, </B> the top serial contact <B> 527, </B> and the earth.



  When the combiners <B> 500 </B> and <B> 600 </B> occupied the third position, the following circuit is established <B>: </B> the earth, left part and the rest contact of the relay <B> 652, </B> the right winding <B> to </B> low resistance of relay 649, the driver <B> 653, </B> the armature and the working contact of the relay <B> 616, </B> the driver 654, the lower right serial contact 65.5, the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, the </B> driver 940, <B> the </B> brush 941, terminal 942, conductor 943, right winding of marginal relay <B> 533, </B> driver 534,

    the left serial contact 535, wind it up from the -relay <B> 523, </B> the battery, and the earth. Like winding <B> to </B> low resistance of relay 649 is alone in the circuit, all relays that <B> y </B> are understood are excited. Relay 649 by attracting its inner right armature closes its own blocking circuit and breaks the shunt normally placed around the winding <B> had to </B> relay <B> 652. </B> The latter being then excited closes the following circuit <B>: </B> the earth, the battery, resistor 648, the right serial contact <B> 697, </B> Winding the relay <B> 652, </B> and the earth.

   The 649 relay by attracting its left armature closes an earth circuit <B> to </B> through <B> the </B> serial contact <B> 656, </B> the relatively low resistance <B> 657, </B> the left armature and the working contact of relay 649, the driver <B> 639, </B> high resistance <B> 658, </B> driver 65811, lower right serial contact 640, driver 947, inside left farmature and relay working contact <B> 937, </B> the conductor 946, the brush 945, the terminal 944, the conductors <B> 508 </B> and <B> 536, </B> the top serial contact <B> 537, </B> the relay winding <B> 515, </B> the battery, and the earth.

   Relay <B> 515 </B> closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the armature and the working contact of the relay <B> 523, </B> the lower left and upper right serial contacts 524, the armature and the normally closed contact <B> of </B> relay <B> 510, </B> the conductor 614, the armature and the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the driver <B> 518, </B> contact <B> 519, </B> and the earth. The combiner <B> 500 </B> thus passes from his third <B> to </B> his fourth position.



  As soon as the combiner <B> 500 </B> reached this fourth position, the relays <B> 515, 523, </B> and 649 are neutralized. Relay 649 closes a circuit passing through the earth, the battery, the electromagnet motor of the coin cutter <B> 600, </B> the right serial contact <B> 698, </B> the outer and upper left armature and the rest contact of relay 644, the right armature and the relay contact <B> 652, </B> the inner right armature and the rest contact of relay 649, and the earth. The combiner <B> 600 </B> then passes from his third <B> to </B> his fourth position, for which the relay <B> 652 </B> is neutralized.



       Man work <I> of the group recorder </I> <I> of districts. </I>



  When the conibineurs <B> 500 </B> and <B> 600 </B> occupies the position <B> 33/1 </B> a circuit is closed <B> to </B> through the earth, the battery, the low resistance <B> 632, </B> the driver <B> 633, </B> the frame and <B> the </B> relay contact <B> 621, </B> the driver <B> 659, </B> the lower left serial contact <B> 655, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> the conductor 940, the brush 941, the terminal 942, the conductors 943 and <B> 501, </B> the lower left serial contact <B> 502, </B> the driver <B> 539,

   </B> the right hand windings of the sensing relays 540 and marginal 541, and the earth. Like resistance <B> 632 </B> is small, relays 540 and 541 are energized, and by attracting their left armatures close a blocking circuit passing through the earth and the conductor <B> 526. </B>



  When the combiners <B> 500 </B> and <B> 600 </B> occupies the fourth position, the following circuit is closed -. earth, the right armature and the rest contact of relay 643, the left winding <B> to </B> low resistance of relay 644, the driver <B> 660, </B> the armature and the relay contact <B> 622, </B> the driver <B> 661, </B> the lower left serial contact <B> 651, the </B> driver 647, the left middle armature and the relay contact <B> 937, </B> the driver 948, the broom 949, the terminal <B> 950, </B> the driver <B> 951, </B> the right winding of the marginal relay 542, the conductor 543,

      the upper right serial contact <B> 509, </B> the running of the relay <B> 510, </B> the battery, and the earth. Since the left winding of relay 644 is low resistance, marginal relay 542 is energized, as well as the relays <B> 510 </B> and 644. This relay <B> 512 </B> closes a blocking circuit for it, and relay 644 in <B> - </B> attracting its internal frame causes the activation of relay 643 in the manner described.



  The armature on the right of this relay 644 by being attracted completes the circuit following the earth, the relatively low resistance 638a, the serial contact on the left <B> 638, </B> the right armature and the contact of relay 644, the driver <B> 639, </B> the armature and make contact of relay 624, conductor 63911, lower left serial contact 640, conductor 947, inner armature left and <B> the </B> relay contact <B> 937, </B> the conductor 946, the brush 945, the terminal 944, the conductor <B> 608, </B> the right winding <B> of </B> marginal relay 544, conductor 545, upper serial contact 546,

   the relay winding <B> 517, </B> the battery, and the earth. As the resistance 638a is low, the two relays <B> 517 </B> and 544 are excited. The latter, by attracting its left armature, completes its own blocking circuit passing through the earth, the driver <B> 359, </B> and the lower right serial contact <B> 527. </B> The relay <B> 517 </B> complete the circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the armature and the rest contact of relay 523, the upper left and lower right serial contacts 524, the armature and the working contact of the relay <B> 510, </B> driver 514,

         the mature and the rest contact <B> of </B> relay 5151 the upper left and lower right serial contacts 516, the armature and <B> le </B> relay working key contact <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> then passes from its fourth <B> to </B> his fifth position.



  As soon as the combiner <B> 500 </B> reached its fourth position, the relays <B> 517, 510 </B> and 644 are neutralized. Relay 644 closes a fired circuit passing through the earth, - the battery, the motor electromagnet. <B> of </B> combiner <B> 600, </B> the lower right serial contact <B> 698, </B> the external right armor and the rest contact of relay 649, the left armature and the open contact of relay 643, the left arm and the rest contact of relay 644, and Earth,

   which has the result of passing the combiner <B> 600 </B> of its fourth <B> to </B> his fifth position. As soon as the combiner <B> 600 </B> leaves its fourth position, relay 643 is neutralized. Han # work <I> of </I> eenî-egisti-eur <I> of office brooms. </I> For the 4 '/ 4 positions of the combiners <B> 600 </B> and <B> 500, </B> Lin circuit is closed <B> to </B> through earth, battery, high resistance <B> 699, </B> the driver <B> 650, </B> the armature and the relay contact <B> 626, </B> the driver <B> 662, </B> the upper left serial contact <B> 651, </B> driver 647,

   the middle armature on the left and the relay contact <B> 937. </B> The conductor 948, the brush 949, the terminal <B> 950, </B> drivers <B> 951 </B> and <B> 528, </B> the upper right serial contact <B> 529, </B> the driver 548, the right windings of the sensitive relays 549 and marginal <B> 550, </B> and the earth. Relay 549 is energized, but due to the high resistance <B> 699, </B> the marginal relay <B> 550 </B> remains neutralized.

    For the fifth positions of combiners <B> 600 </B> and <B> 500, </B> the following circuit is closed <B>: </B> the earth, the left armature and the rest contact of the relay <B> 652, </B> the right roll <B> to </B> low resistance of relay 649, the conductor <B> 653, </B> the armature and the relay contact <B> 627, </B> the driver <B> 663, </B> the upper left serial contact <B> 655, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> conductor 940, brush 941, terminal 942, conductor 943, right winding of marginal relay <B> 551, </B> the driver <B> 552, </B> the right serial contact <B> 535,

   </B> the relay winding <B> 523, </B> the battery, and the earth. The relays <B> 523 </B> and 649 are excited, as well as the marginal relay <B> 551 </B> since the winding <B> to </B> Relay 649 high resistance is not in the circuit. The re lais 649 by attracting its inner right armature breaks the shunt placed around the winding <B> of </B> relay <B> 652, </B> and this one attracts its frames. The marginal relay'551 closes a blocking circuit for itself <B> to </B> tra towards its winding and its left armature, the conductors <B> 816 </B> and <B> 526, </B> and the earth.



  Relay 649 completes the circuit passing through earth, the right serial contact <B> 656, </B> resistance <B> 657, </B> the left armature and the contact of relay 649, the driver <B> 639, </B> high resistance <B> 658, </B> conductor 658a, lower right serial contact 640, conductor 947, inner left armature and relay contact <B> 937, </B> the conductor 946, the brush 945, the terminal D44, the conductors <B> 508 </B> and <B> 536, </B> the top serial contact <B> 537, </B> Relay winding <B> 515, </B> the battery, and the earth.

   Relay 515 is energized and forms the following circuit <B>: </B> the earth, the bat terie, the motor electromagnet of the combiner <B> 500, </B> the driver <B> 522, </B> the armature and the working contact of the relay <B> 523, </B> the lower left and upper right serial contacts 524, the armature and the rest contact of the relay <B> 510, </B> the conductor 514, the armature and) the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the armature and the rest contact of the relay <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and the earth.

   The combiner <B> 500 </B> then passes from his fifth <B> to </B> his sixth position. As soon as this combiner leaves its fifth position, the relays <B> 515, </B> <B> 523, </B> and 649 are neutralized. Relay 649 closes the circuit above traced for the motor electromagnet <B> of </B> combiner <B> 600, </B> which then passes from its fifth <B> to </B> its sixth position. Man work <I> of the group recorder </I> <I> of offices. </I>



  For positions 53/4 of combiners <B> 600 </B> and <B> 500, </B> a circuit is closed <B> to </B> through the earth, the windings <B> of </B> right of marginal relays <B> 553 </B> (fig. <B> 15) </B> and sensitive 554, the driver <B> 555, </B> the lower right serial contact <B> 502, </B> drivers <B> 501 </B> and 943, terminal 942, brush 941, conductor 940, left outer armature and relay contact <B> 937, </B> the driver <B> 636, </B> the upper right serial contact <B> 655, </B> and driver 664, but like the relays <B> 665 </B> and <B> 666 </B> are neutralized, this circuit is not completed, and the relays <B> 553 </B> and 554 remain neutralized.



  By the sixth positions of the combiners <B> 600 </B> and <B> 500, </B> the next circuit is closed <B>. </B> the earth, the right armature and <B> the </B> contact <B> of </B> rest of relay 643, the two in bearings of relay 644 in series, the lower serial contact 646, the conductor 647, the middle left ar mature and the contact of the relay, the conductor 948, the brush 949, terminal <B> 950, </B> the driver <B> 951, </B> the right winding of the marginal relay 547, the conductor 548, the lower serial contact <B> 509, </B> the relay winding <B> 510, </B> the battery and the earth.

   The marginal relay 547 remains neutral due to the presence in the circuit of the winding <B> to </B> high, resistance of relay 644, but the relays <B> 510 </B> and 644 are excited. The latter, by attracting its inner left armature, closes its blocking circuit described above, and also breaks the shurit around the relay 643, which consequently is energized.



  Relay 644 also closes the following circuit <B>: </B> earth, resistance 63811, left serial contact <B> 638, </B> the frame. and the contact of relay 644, the conductor <B> 639, </B> Parmature and contact of the relay <B> 631> </B> the conductor 640a, the upper serial contact 640, the conductor 947, the left inner armature and the relay contact <B> 937, </B> the driver 946, the broom.

   945, terminal 944, <B> the </B> driver <B> 508, </B> the top serial contact <B> 507, </B> the driver <B> 556, </B> the right bearing of the marginal relay <B> 557, </B> the driver <B> 558, </B> the relay winding <B> 517, </B> the battery, and the earth. <B> A </B> because of the low resistance of this circuit the marginal relay <B> 557 </B> is excited, and by attracting its mature left rear closes a blocking circuit passing through the earth, the conductor <B> 559, </B> and the lower right serial contact <B> 527. </B> The relay <B> 517 </B> is also excited and firm <B> the </B> circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the driver <B> 522, </B> the armature and the rest contact of the relay <B> 523,

   </B> the serial contacts on the upper left and lower on the right 524, the armature and the working contact of the relay <B> 5 10, </B> conductor 514, armature and relay idle contact <B> 515, </B> the upper left and lower right serial contacts 516, the armature and the working contact of the relay <B> 517, </B> the driver <B> 518, </B> the serial contact [ <B> 519, </B> and the earth. The combiner <B> 500 </B> thus passes from his sixth <B> to </B> his seventh position.



  As soon as the combiner <B> 500 </B> leaves its sixth position, the 'relays <B> 515, 510 </B> and 644 are neutralized. Relay 644 closes the circuit mentioned above, for the motor electromagnet of the combiner <B> 600, </B> which passes from its sixth <B> to </B> his seventh position.



  If the operator has completed the operation of the keys from her table corresponding to the requested number, lowering the <B> key </B> The result is to complete the circuit not healthy by the earth, the battery, the motor electromagnet of the combiner <B> 600, </B> the upper right serial contact <B> 613, </B> the driver <B> 668, </B> the <B> key 667, </B> and the earth, which brings the combination <B> 600 </B> of his seventh <B> to </B> his eighth <B> Po- </B> sition.

           Man work <I> broom recorders </I> of a "-ivation. When the combiner <B> 600 </B> reaches its position <B> 7 </B> 1/4 and the combiner <B> 500 </B> his position <B> 6 </B> '/ 4, a circuit is closed <B> to </B> through the earth, the battery, the windings <B> to </B> bass and <B> to </B> high resistance in series of the relay <B> 669, </B> the ignition of the key <B> 670, </B> the driver <B> 671, </B> the lower left serial contact <B> 672, </B> the conductor 647, the left middle armature and the relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> the driver <B> 951,

   </B> the lower right serial contact <B> 559, </B> the driver <B> 560, </B> the left windings of the sensitive relays <B> 561 </B> and marginal <B> 562, </B> and the earth '. The marginal relay remains neutralized due to the presence in the circuit of the winding <B> to </B> high resistance of the relay <B> 669, </B> but the relays <B> 669 </B> and <B> 561 </B> are excited. The latter by attracting its right armature closes a blocking circuit passing through the earth, the battery., The right winding of the relay <B> 561, </B> the right armature and the relay contact <B> 561, </B> conductors 563 and <B> 763, </B> the top serial contact <B> 527 </B> and the earth.



  When the combinjur <B> 600 </B> reaches its eighth position and the combiner <B> 500 </B> its seventh position, a circuit is closed <B> to </B> through the earth, the armature on the left and the rest contact of the relay <B> 652, </B> the right winding <B> to </B> low resistance of relay 649, the conductor <B> 653, </B> contact <B> 673 </B> of the <B> key, </B> the driver 674, the upper left serial contact <B> 635, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> the conductor 940, the brush 941, the terminal 942, the conductors 943 and <B> 501, </B> the left bearing of marginal relay 564, the driver <B> 565, </B> the right serial contact <B> 566,

   </B> the winding of relay 523, the battery and the earth. The marginal relay 564 being energized, since the circuit includes only the winding <B> to </B> low resistance of relay 649, closes by its right armature a blocking circuit for its right winding <B> to </B> through the earth, the conductor <B> 563, </B> and the higher serial contact <B> 527, </B> Relays <B> 523 </B> and 649 are excited and the latter completes by its inner right armature a blocking circuit for itself and breaks the shunt created around the coil of the relay <B> 652 </B> which then restores current.



  The following circuit is also completed by relay 649 <B>: </B> the earth, the serial contact <B> 656, </B> low resistance <B> 657, </B> the left armature and the contact of relay 649, the conductor <B> 639, </B> the armature and the relay contact <B> 669, </B> the left serial contact <B> 675, </B> conductor 9471, inner -an- click armature and relay contact <B> 937, </B> the coriduc- tor 946, the brush 945, the terminal 944, the conductors <B> 508 </B> and <B> 536, </B> the left winding <B> of </B> marginal relay 5'67, driver 567-1,

      the lower right serial contact <B> 537, </B> the winding of relay 515, the battery, and the earth. The low resistance of <B> this </B> circuit allows the marginal relay to operate and by its right armature it closes for either right winding a blocking circuit passing through the earth, the conductors <B> 568 </B> and <B> 559, </B> and the lower serial contact <B> of </B> right <B> 527. </B>



  The relay 515 being also energized in the previous circuit, completes a new circuit passing through the earth, the battery, the motor electromagnet of the combiner. <B> 500, </B> the conductor 522, the armature and the working contact <B> of </B> relay <B> 523, </B> the lower left and upper right serial contacts 524, the armature and the rest contact of the relay <B> 510, </B> the conductor 514, the armature and the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the armature and the rest contact of the relay <B> 517, </B> the driver <B> 518,

   </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> moves from its seventh <B> to </B> his eighth position, and as soon as he left seventh position the relays <B> 515, 523 </B> and 649 are neutralized. The latter closes the circuit traced above for the motor electromagnet of the combiner <B> 600 </B> which passes from its eighth <B> to </B> his ninth position, for which the relay <B> 65.9 </B> is neutralized.



       Work <I> group recorders </I> arrival <I> and final brooms. </I>



  Bridge - the 8/4 position of the combiner <B> 600 </B> and the position <B> 7 </B> 3/4 of the combiner <B> 500 </B> the following circuit is closed <B>: </B> earth, battery, relatively low resistance <B> 677, </B> the driver <B> 682, </B> contact <B> 666 </B> of the <B> key, </B> the upper right serial contact 635, the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> conductor 940, broom 941, terminal 942, conductors 943 and <B> 501, </B> the right serial contact <B> 569, </B> the driver <B> 570, </B> the left windings of the sensitive relays <B> 571 </B> and marginal <B> 572, </B> and the earth.

   The low resistance of this circuit allows the excitation of the two relays <B> 571 </B> and <B> 572, </B> who cry attracting their armor of the right close a blocking circuit passing through the windings of the right, the conductors <B> 563 </B> and <B> 763, the </B> upper serial contact <B> 527 </B> and the earth.



  When the corabineur <B> 600 </B> reached his ninth position and the combiner <B> 500, </B> its eighth position, a circuit is closed <B> to </B> through the earth, the right armature and the rest contact of relay 643, the windings <B> to </B> bass and <B> to </B> high resistance in series of relay 644, lower serial contact 646, conductor 647, left middle armature and relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> the driver <B> 951, </B> the left winding of the marginal relay <B> 573, </B> the driver 573a. the left serial contact 574, the relay winding <B> 510, </B> the battery, and the earth.

   The marine relay <B> 573 </B> remains neutralized due to the presence of the high resistance of relay 644 in the circuit. However the relays <B> 510 </B> and 614 are excited, and the latter closes a blocking circuit by its internal frame <B> of </B> left. In addition, it causes relay 643 to be energized in the manner described above.



  Relay 644 by attracting its right armature closes a circuit passing through the earth, low resistance 638a # the left serial contact <B> 638, </B> the right frame and the contact <B> says </B> relay 644, the driver <B> 639, </B> high resistance <B> 658, </B> the conductor 639a, the lower right serial contact 640, the conductor 947, the inner left armature and the relay contact <B> 937, </B> the conductor 946, the brush 945, the terminal 944, the couplers 508 and <B> 536, </B> the left winding of the marginal relay <B> 575, </B> the driver 57511,

      the left serial contact 546, the relay rolling <B> 517, </B> the battery, and the earth. The marginal relay <B> 575 </B> remains neutralized due to the high resistance <B> 658, </B> but the relay <B> 517 </B> is excited and closes the next circuit <B>:

   </B> the earth., The battery, the motor electromagnet of the combiner <B> 500, </B> the driver <B> 522, </B> the armature and the rest contact of the relay <B> 523, </B> the upper left and lower right serial contacts 524, the armature and the make contact (read relay <B> 510, </B> the conductor 514, the armature and the rest contact of the relay <B> 515, </B> the upper left and lower right serial contacts <B> 516, </B> the arming and working contact of the relay <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> then moves from its eighth <B> to </B> his ninth position.



  As soon as the combiner <B> 500 </B> leaves his eighth position the relays <B> 517, 510 </B> and 644 are neutralized. Relay 644 closes <B> the </B> circuit traced above for the motor electromagnet of the combiner <B> 600 </B> which moves from its ninth <B> to </B> its tenth position, thus causing the neutralization of relay 643. <I> Operation of the final recorder </I> <I> tens. </I> As a result of the work of the <B> key </B> tens No <B> 5, </B> the relay <B> 678 </B> is excited by the current <B> to </B> through a comprehensive circuit <B>: </B> the earth, the battery, the windings <B> to </B> bass and <B> to </B> high resistance of relay 6i8, the contact <B> 670 </B> of the <B> key, </B> and <B> there </B> earth.

    



  Corresponding <B> to </B> the tenth position of the combiner <B> 600 </B> and <B> to </B> the-ninth position of the combiner <B> 500, </B> the following circuit is completed <B> - </B> the earth, the left armature and the de-contact of the relay <B> 652, </B> the windings <B> to </B> high and <B> to </B> low resistance of the relay 649 in series, the lower serial contact <B> 680, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> the conductor 940, the brush 941, the terminal 942, the conductors 945 and <B> 501, </B> the left winding of the marginal relay <B> 579, </B> the driver <B> 580,

   </B> the lower left serial contact <B> 566, </B> the relay winding <B> 523, </B> the battery, and the earth. The marginal relay <B> 579 </B> is not excited <B> to </B> cause of the high resistance of the relays 649, but the relays <B> 523 </B> and 649 are, and the last of these closes a blocking circuit with its inner right armor.

   This relay also causes the relay to be energized. <B> 652 </B> in the way <B> already </B> described. <B> - </B> The 649 relay by attracting its left armature closes a circuit passing through the earth, the serial contact <B> 656, </B> the bass.

   resistance <B> 657, </B> the frame <B> of </B> left and contact of relay 649, the driver <B> 639, </B> the armature and the relay contact <B> 678, </B> the upper right serial contact <B> 675, </B> the conductor 947, the inner left armature and the relay contact <B> 937, </B> -the conductor-946, the brush 945, the terminal 944, the conductors <B> 508 </B> and <B> 536, </B> the left winding of the marginal relay Ul, the conductor 58111, the serial contact <B> ' </B> lower left <B> 537, </B> winding <B> of </B> relay <B> 515, </B> the battery, and the earth.

   Due to the low resistance of the circuit, the marginal relay <B> 581 </B> is excited and 'closes by its right armature a blocking circuit for its winding of. right <B> to </B> through the earth, the conductor <B> 568, </B> and the serial contact, lower <B> of </B> right <B> 627. </B> Relay 515 is also energized, and closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the driver <B> 522, </B> the mature ar and the contact of the relay work <B> 523, </B> the lower left and upper right serial contacts 524, Farmature and <B> the </B> relay neutral contact <B> 510, </B> driver 514,

   the armature and the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the armature and the rest contact of the relay <B> 517, </B> the coupler <B> 518, </B> serial contact <B> 519, ' </B> and the earth. The cornbineur <B> 500 </B> goes from its ninth <B> to </B> his tenth position.



  As soon as the combiner <B> 500 </B> leaves its ninth position, the relays <B> 515, 623 </B> and 649 are neutralized, and <B> the </B> last of these closes the circuit traced for the motor electromagnet of the combiner <B> 600 </B> which goes from its tenth <B> to </B> his eleventh position for which the relay <B> 652 </B> is neutralized.

         <I> Operation of the final unit recorder. </I> When the combiner <B> 600 </B> reaches its position 103/4 and the combiner <B> 500 </B> its position <B> 9 </B> 3 / .i, a circuit is closed <B> to </B> through the earth, the battery, the windings <B> to </B> high and <B> to </B> low resistance of the relay <B> 581, </B> contact <B> 683 </B> of the <B> key, </B> the upper serial contact of left <B> 680, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> the conductor 940, the brush 941, the terminal 942, the conductors 943 and <B> 501,

   </B> the left serial contact <B> 569, </B> the driver <B> 582, </B> the left windings of the sensitive relays <B> 583 </B> and marginal 584, and land. The marginal relay remains neutralized due to the high resistance of the relay winding <B> 581 </B> but the relays <B> 583 </B> and <B> 581 </B> are excited. Relay <B> 583 </B> by its right armature closes for its right winding a blocking cir cuit passing through the earth, the conductor <B> 568, </B> and the lower right serial contact <B> 527. </B>



  When the combiner <B> 600 </B> reaches its eleventh position and the combiner <B> 500 </B> its tenth position, a circuit is closed passing through the earth, the right armature and the rest contact of relay 643, the left winding <B> to </B> low resistance of relay 644, contact 684 of the <B> key, </B> the upper left serial contact 646, the conductor 647, the left middle armature and the relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> the driver <B> 951, </B> the left bearing of the marginal relay <B> 585, </B> the 585th conductor, the right serial contact 574, the relay winding <B> 510, </B> the battery, and the earth.

   The marginal relay <B> 585 </B> is excited since the circuit is low resistance and by its right armature it closes its blocking circuit <B> to </B> through the earth, its right winding, the conductor <B> 568 </B> and the lower serial contact <B> of </B> right <B> 527. </B> In addition, relays 644 and <B> 510 </B> are excited. The first of these closes a blocking circuit via its left inner ai-mature and also causes relay 643 to be energized in the manner described above.

      The right armature of relay 644 completes a circuit passing through earth, low resistance 63811, <B> the </B> left serial contact <B> 638, </B> the right frame and the working contact <B> of </B> relay 644, the driver <B> 639, </B> the armature and the relay contact <B> 681, </B> the lower right serial contact <B> 675, </B> the driver 947, the left inner frame and <B> the </B> contact (read relay <B> 937, </B> the conductor 946, the brush 945, the terminal 944, the conductors <B> 508 </B> and <B> 536, </B> the left winding of the marginal relay <B> 586, </B> driver 586,

  17 the lower right serial contact 546, the relay winding <B> 517, </B> the battery and the earth. The marginal relay <B> 586 </B> being therefore included in a circuit <B> to </B> low resistance is excited, and its right armature closes a blocking circuit passing through the earth, the conductor <B> 568, </B> and the lower right serial contact <B> 527. </B> The relay <B> 517 </B> is also excited and closes the next circuit <B>:

   </B> the earth, the battery, the motor electromagnet <B> of </B> combiner <B> 500, </B> the driver 522, the arming and the rest contact of the relay <B> 523, </B> the higher serial contacts <B> of </B> left and lower right 524, the armature and the working contact of the relay <B> 510, </B> the conductor 514, the armature and the rest contact of the relay <B> 515, </B> the upper left and lower right serial contacts <B> 516, </B> the armature and the relay contact <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and <B> the </B> earth. The combiner <B> 500 </B> then goes from his tenth <B> to </B> his eleventh position.



  As soon as the combiner <B> 500 </B> leaves its tenth position, the relays <B> 517, 510 </B> and 644 are neutralized. Relay 644 closes by its left armature the above circuit traced for the motor electromagnet of the combiner <B> 600, </B> which passes from its eleventh <B> to </B> his twelfth position. For this last position, the 643 re lais is neutralized.

       <I> Operation of the station recorder. </I> When the conibineur <B> 600 </B> reaches its position <B> It 3/1 </B> while the combiner <B> 500 </B> has stained its position <B> 10 </B> 3/4, a circuit is formed <B> to </B> through the earth, the left windings of the marginal relays <B> 587 </B> (fig. <B> 16) </B> and sen sitive <B> 588, </B> the driver <B> 599, </B> the top serial contact <B> 559, </B> the driver <B> 951, </B> the terminal <B> 950, </B> the broom <B> 919, </B> the driver 948, the middle armature on the left and the rest contact of the relay <B> 937, </B> driver 647, upper right serial contact 646, but as no <B> key </B> of stations is lowered,

    this circuit is not completed and the relays <B> 587 </B> and <B> 588 </B> therefore remain neutralized.



  For the twelfth position of the combiner <B> 600 </B> and the eleventh position of the combiner <B> 500, </B> the following circuit is completed <B>: </B> the earth, the left armature and the rest contact of the relay <B> 652, </B> the windings <B> to </B> high and <B> to </B> low resistance in series of relay 649, the lower serial contact <B> 680, </B> the driver <B> 636, </B> the external armature and the working contact of the relay <B> 937, </B> conductor 941), brush 941, terminal 942, conductors 943 and <B> 501, </B> the left winding of the marginal relay <B> 590, </B> driver 59011, the upper serial contact <B> 566, </B> the relay winding <B> 523,

   </B> the battery and the earth. The presence in the winding circuit <B> to </B> Relay 649's high resistance prevents the marginal relay from being energized. However the relays <B> 523 </B> and 649 are excited, and the latter closes by its mature inner right rear a blocking circuit while the relay <B> 652 </B> is excited as described above.



  In addition, relay 649 closes the following circuit: earth, serial contact <B> 656, </B> low resistance <B> 657, </B> the left armature and the contact of relay 649, conductor 639, high resistance <B> 658, </B> driver 658a, <B> - </B> lower right serial contact 640, conductor 947, inner left armature and relay contact <B> 937, </B> conductor 946, brush 945, terminal 944, conductors <B> 508 </B> and <B> 536, </B> the top serial contact <B> 537, </B> the relay winding <B> 515, </B> the battery and the earth.

   Relay <B> 515 </B> is excited and closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the driver 522, the armature and the working contact <B> of </B> relay <B> 523, </B> the lower left and upper right serial contacts 524, the armature and the rest contact of the relay <B> 510, </B> the conductor 514, the armature and the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the mature ar and rest contact of the relay <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and the earth.

   The combiner <B> 500 </B> then moves from its eleventh <B> to </B> his twelfth position.



  As soon as the combiner <B> 500 </B> leaves its eleventh position, the relays <B> 515, 523 </B> and 649 are neutralized. Relay 649 closes the circuit traced above for the motor electromagnet of the combiner <B> 600, </B> who by going from his twelfth <B> to </B> his thirteenth position causes the neutralization of the relay <B> 652. </B>



   <I> Recovery <B> at the </B> normal table position </I> <I> keys <B> and </B> of its control devices. </I> For the thirteenth position of the combiner <B> 600 </B> a circuit is closed <B> to </B> through earth, battery, serial contact <B> 685, </B> the driver <B> 686, </B> the windings of all the electro-magnets triggering the keys <B> 601 </B> in parallel, and the earth. Electromagnets <B> 601 </B> bring back the lowered keys <B> to </B> their rest position and when this is done the blocking circuits of all relays which are kept energized under direct key command are opened.

   The relays <B> 608 </B> and <B> <i> 609 </I> </B> <I> iron- </I> is a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> <I> 600, </I> </B> serial contact <I> interior <B> 613, </B> </I> the driver <B> 687, </B> the armatures on the right and the rest contacts of the relays <B> 608 </B> and <B> 609, </B> and the earth. The combiner <B> 600 </B> from his thirteenth <B> to </B> its fourteenth position, and as soon as this combiner left its thirteenth position, the relays <B> 602 </B> and <B> 937 </B> are neutralized.



  If he <B> y </B> has a sender selector from the operator's position not employed <B> to </B> this moment, the combiner <B> 600 </B> leaves immediately his fourteenth position and takes his first position under the action of the following circuit <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 600, </B> the upper left serial con tact <B> 698, </B> the coupler <B> 688, </B> to the corresponding serial contact <B> to 939 </B> of this free senders picker, and land.

   On the other hand, if all the sender selectors are busy, <B> the </B> combiner <B> 600 </B> stay in its fourteenth position until one of these comes back <B> to </B> its normal position, and <B> to </B> this moment <B> the </B> circuit traced above is established to bring back the combiner <B> 600 to </B> its normal position. The key table and its control devices are then ready to control the operation of other senders and other sets of recorders.

       <I> Selection of district brooms. </I> When the combiner <B> 500 </B> reaches its seventh position, the control of the operation of the selection of brushes in the district selector begins.

   A fundamental circuit is closed <B> to </B> through the <I> earth, </I> the battery, Left winding of the relay <B> 903, </B> lower serial contacts <B> 909, </B> the driver 954, the broom <B> 955, </B> the terminal <B> 956, </B> the driver <B> 957, </B> the serial contact [ <B> 590, </B> the driver <B> 819, </B> the upper right serial contact <B> 820, </B> the driver <B> 821, </B> the left armature and the counter relay rest contact <B> 01, </B> the relay winding not <B> to </B> not <B> 701, </B> the top serial contact <B> 702, </B> resistance <B> 703 </B> and the earth. The relays <B> 903 </B> and <B> 701 </B> are excited.

    Relay <B> 701 </B> closes a circuit passing through the earth, the battery, the winding of the counter 4 relay, the armatures and the rest contacts of the counter relay 41 and of the relay 704, the feeder and the working contact of the relay <B> 701, </B> and the earth. The counter relay 4 is energized and closes a circuit passing through the earth, the battery, the windings of the counter relays 4 and 4 ', the armature and the contact of the counter relay 4, the conductor <B> 705, </B> the left serial contact <B> 706, </B> the driver <B> 707, </B> the right-hand serial contacts <B> 512, </B> the mature ar and the working contact of the relay <B> 511 </B> and the earth.

   Counter relay 41 is however not energized <B> to </B> this moment as a result of the shunt established around its winding, which is closed <B> to </B> the frame and in contact <B> of </B> relay work <B> 701. </B> The relay <B> 903 </B> closed by its right armature a blocking circuit, passing through the earth, the battery, the left winding of the relay <B> 903, </B> the lower left serial contact <B> 909, </B> the right armature and the working contact of the relay <B> 903, </B> the lower serial contact <B> 910, </B> and the earth <B> to </B> through the circuit originally described.

   Relay <B> 903 </B> closes the next circuit again <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the lower left serial contact <B> 907, </B> the driver <B> 908, </B> the left armature and the contact of the relay <B> 903, </B> and the earth.

    The combiner <B> 900 </B> from his seventh <B> to, </B> his eighth position, and then a circuit is closed <B> to </B> through the earth, the battery, the electric motor of the combiner <B> 10 </B> (fig. <B> 1), </B> the lower left serial contact <B> 26, </B> the driver <B> 27, </B> the upper serial contact 420, the conductor 411, the outer right armature and the working contact of the relay 924, the conductor <B> 959, </B> the lower left serial contact <B> 915, </B> the driver <B> 908,

   </B> the left armature and the contact of the relay <B> 903, </B> and the earth. The combiner <B> 10 </B> then passes from his second <B> to </B> his fourth position.



  Bridge - this last position, the next circuit is completed <B>: </B> the earth, the battery, Winding of the vertical electromagnet <B> 28, </B> the lower right serial contact 14, the conductors <B> 13 </B> and <B> 27, </B> and <B> to </B> the earth <B> to </B> through the left armature and the contact of the relay <B> 903 </B> of the previous circuit.

   The electromagnet motor <B> 28 </B> by attracting its frame press the motor tape <B> 9.9. </B> against the pulley <B> to </B> continuous rotary movement <B> 30. </B> The brush holder rod <B> 31 </B> lie in a vertical direction, and like the broom <B> 32 </B> comes in contact with <B> the </B> driver segment of the switch <B> 33, </B> a circuit is established <B> to </B> across the earth, the upper right serial contact <B> 18, </B> the broom <B> 32, </B> the segment <B> 83, </B> the left serial contact 34, the driver <B> 35, </B> the upper serial contact 422, the conductor 413, the left exterior parameter and the relay contact û3û, the conductor <B> 960,

   </B> the lower right serial contact <B> 917, </B> driver 954, the lower serial contact <B> 910, </B> the right armature and the working contact of the relay <B> 903, </B> the lower left serial contact <B> 909, </B> the left winding of the relay <B> 903, </B> the battery, and the earth. This branch circuit diverts enough current from the relay winding not <B> to </B> not <B> .701 </B> to carry out its neutralization and the activation of the counter 4 'relay.

   As soon as the brush 32 comes into contact with an insulating segment of the switch <B> 33, </B> the relay <B> 701 </B> is still excited and closes the next circuit <B>: </B> earth, battery, relay winding, meter <B> 3, </B> the armature and the counter relay reset contact <B> 3 ', </B> the armature and the working contact of counter relay 41, the armature and the rest contact of the relay 704, the armature and the working contact of the relay <B> 701, </B> and the earth. The counter relay 3-is energized and thus prepares as a circuit for the counter relay 31.



  The energization of counter relay 41 also closes a circuit in parallel with the relay. <B>. </B> counter <B> 8 </B> and passing through the earth, the battery, the winding of the meter relay <B> 0, </B> the upper right serial contact <B> 712, </B> the cond uctor <B> 711, </B> the top serial contact <B> of </B> right <B> 710, </B> the driver 824, the serial contact <B> 823, </B> the driver <B> 822, </B> the armature -right and the working contact of relay '631, the inner armature on the right and the key contact of the relay <B> 533, </B> the inner right hand armature -and the rest contact of the relay <B> 532,

   </B> the driver <B> 709 </B> (fig. <B> 15 </B> and <B> 13), </B> the lower serial contact <B> 708, </B> I armature- and the working contact of the counter relay 4 ', the armature and the rest contact of the relay 704, the armature and <B> the </B> relay working contact <B> 701, </B> and the earth.

   The counter relay <B> 0 </B> is excited and firm <B> to </B> his arma- 'a circuit for the counter relay <B> 0 '. </B> -The counter relay <B> 0 ' </B> is however bypassed this moment <B> to </B> through the frame and <B> the </B> relay working contact <B> 701. </B> As soon as the broom <B> 32 </B> comes in contact with a second time. conductive segment of the switch.

       3.3-, the relay not <B> to </B> not <B> 701 </B> is' you off, still excited <B> ' </B> as well as the counter-opening relay <B> to </B> its left frame and <B> to </B> its break contact the relay excitation circuit <B> 903. </B> As soon as the brush 32 passes over the insulating segment adjacent to the switch <B> 33, </B> the relay <B> 903 </B> opens the circuit of the electromagnet <B> 28. </B> In addition, this relay closes a circuit including <B>:

   </B> the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the lower serial contact <B> 86, </B> the driver <B> 37, </B> the upper serial contact 428, the driver <B> 935, </B> the left inner frame and <B> - </B> the working contact of the relay <B> 930, </B> the upper right serial contact 934, the left armature and the normally closed contact of the relay <B> 903, </B> and the earth. The combiner <B> .10 </B> pass from his fourth <B> to </B> his fifth position.



  When the counter relay <B> 01 </B> is excited, a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combi-, <B> 700, </B> the driver <B> 713, </B> the left serial contact <B> 884, </B> the driver <B> 715, </B> the right armature and the counter relay contact <B> 0 ', - </B> the right serial contact <B> 706, </B> the driver <B> 707, </B> the right serial cointacts 512, the right ai-mature and the working contact of the relay <B> 511, </B> and the earth.

   The combiner <B> 700 </B> from its first <B> to </B> its second position. A circuit is then closed comprising <B>. </B> - nant the earth, the battery, the motor electromagnet of the combiner <B> 700, </B> the driver <B> 713, </B> the lower left serial contact <B> 717, </B> -the armatures and the rest contacts of the relays <B> 718 </B> and <B> 719, </B> and the earth. The combiner <B> 700 </B> thus passes from his second <B> to </B> its third position opening the circuits of the counters relays on contact <B> 706. </B>



  When the combiner <B> 10 </B> reaches its fifth position, the following circuit is closed <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the driver <B> 920, </B> the upper left serial contact <B> 921, </B> Par- mature left median and contact <B> of </B> relay <B> 930, </B> the driver <B> 961, </B> the superior serial contact 424, the conductors 415 and <B> 38,

   </B> the lower left and upper right serial contacts 24, the left armature and the Telais working contact <B> 7, </B> and the earth. The combiner <B> 900 </B> from its eighth <B> to </B> his ninth position.



   <I> Search for a free senders selector. </I> When the combiner <B> 900 </B> reaches its ninth position, a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the distributor 400, the upper contact 408, the conductor 417, the serial contacts on the right <B> 962, </B> the driver <B> 963, </B> the right armature and the, rest contact of relay 937 (assuming that all the recorders have been fitted), the upper left contact <B> 939., </B> and the earth.

   Distributor 400 moves from its fourth <B> to </B> its fifth position, then directly in its first position if a sender selector is free <B> to </B> this moment as a result of the following circuit <B>: </B> the earth, the battery, the motor electromagnet of the distributor 400, the serial contact 407, the conductor 418, the left serial contacts corresponding to the contacts <B> 962 </B> from the free sender selector, and <B> the </B> earth. Otherwise, distributor 400 remains in its fifth position until a sender selector becomes free.

   If the sender selector which is chosen for the first position of distributor 400 is occupied, a circuit is closed <B> to </B> Through the earth, the motor electromagnet of the distributor 400, the serial contacts corresponding to the contacts <B> 962 </B> placed under the control of this busy sender selector. Distributor 400 therefore switches to its second position, and similarly continues to search for a free sender selector.

   When it reaches the position for which a sender selector is found, the search movement is stopped then that there is no completed circuit for the motor electromagnet of distributor 400, since the combiner <B> 900 </B> associated with the selected free sender selector is in its first position.

       <I> Selection of groups of districts. </I> When the combiner <B> 700 </B> reaches its position 2 3/4, a circuit is closed <B> to </B> through earth, battery, winding of relay 704, upper right serial contact <B> 719, </B> the driver <B> 720, </B> the outer right armature and the contact of relay 544, the conductor <B> 89-7, </B> serial contact <B> 828, </B> and the earth.



  When the combiner <B> 900 </B> reached his ninth position and the combiner <B> 700 </B> its third position, the fundamental circuit drawn above is closed, and the relays <B> 903 </B> and <B> 701 </B> are excited. The last of these completes by its armature a circuit passing through the earth, the battery, the winding of the counter relay <B> 9, </B> the armature and the counter relay reset contact <B> 9 ', </B> the armature and the contact of the relay 704, the armature and the contact of the relay <B> 701, </B> and the earth.

      Relay <B> 903 </B> closes a circuit comprising the earth, the battery, the motor electromagnet of the combiner <B> 900, </B> the lower left serial contact <B> 907, </B> the driver <B> 908, </B> the left armature and the relay working contact <B> 903, </B> and the earth, which brings the coin-hoe <B> 900 </B> of his ninth <B> to </B> its tenth position. By its right armature the relay <B> 903 </B> closes the blocking circuit traced above and connected <B> to </B> the earth through the fundamental circuit.



  The tenth position of the combiner <B> 900 </B> corresponds to the circuit passing through the earth, the battery, the motor electromagnet of the combination <B> 10, </B> the lower left serial contact <B> 26, </B> the driver <B> 27, </B> the upper serial contact 420, the conductor 411, the outer right armature and the relay contact 924, <B> the </B> driver <B> 959, </B> the serial contact of _left <B> 915, </B> the driver <B> 908, </B> the left armature and the contact of the relay <B> 903 </B> and the earth. The combiner <B> 10 </B> then passes from his fifth <B> to </B> his sixth position.

    



  The sixth position of the combiner <B> 10 </B> corresponds to the circuit passing through the electromagnet <B> 28 </B> and comprising the earth, the battery, the winding of the vertical electromagnet <B> 28, </B> the lower right serial contact 14, the conductors <B> 13 </B> and <B> 27, </B> and to earth via the left armature and the relay contact <B> 903, </B> and the circuit described above.

   Under the control of the electromagnet 28, the brush holder rod <B> 31 </B> moves up again. <B> This </B> movement <B> of </B> the rod triggers the second set <B> of </B> brushes 44, 45 and 46, since the triggering electromagnet <B> 65 </B> is excited <B> to </B> through the following circuit <B>: </B> the earth, the battery, the winding of the electromagnet <B> 65, </B> the lower serial contact <B> 18 </B> and the earth.



  Like the broom <B> 39 </B> the switch comes into contact with the conductive segment 40, a circuit is closed & <B> to </B> through earth, battery, left winding of relay <B> 903, </B> the lower left serial contact <B> 909, </B> Parameter on the right and the working contact of the relay <B> 903, </B> the c <B> ' </B> upper left serial ontact <B> 910, </B> Left interior parmature and relay working contact <B> 930, </B> the driver <B> 935,

   </B> the serial-superior contact 428, the -conductors <B> 37 </B> and 43, the upper serial contacts 42, the conductor 41, the switch 40, the brush <B> 39, </B> the upper right serial contact <B> 18, </B> and the earth. Closing this circuit causes the relay to be bypassed. <B> to </B> not <B> 701, </B> which <B> to </B> its turn triggers the excitation of the counter relay <B> 91. </B> As soon as the brush 32 comes into contact with an insulating segment of the switch, <B> 16 </B> relay not <B> to </B> not <B> 701 </B> is still excited.

   Likewise, the counter relays are energized until the brush <B> 39 </B> make contact with the eighth conductive segment for which the counter relay 21 is energized. When the broom <B> 39 </B> passes on the eighth isolated segment, the relay <B> 701 </B> being excited, a circuit is closed <B> to </B> through the earth, the battery, the winding of the meter relay <B> 0, </B> the upper right serial contact <B> 712, </B> the driver <B> 711, </B> the lower serial contact <B> 720, </B> the driver <B> 721. </B> serial contact <B> 829, </B> I driver <B> 830, </B> the right armatures, and the working contacts of relays 540, 542 and 541, the conductor <B> 722 </B> (fig. <B> 15 </B> and <B> 13),

   </B> -the lower serial contact <B> 723, </B> the armatures and working contacts of the counter relays 21 <B> to 91 </B> in series, the armatures and the working -contacts of relays 704 and <B> 701, </B> and the earth. The counter relay <B> 0 </B> is excited and prepares a Circuit -For <B> 16 </B> relay-counter <B> 01. </B> As soon as the broom <B> 39 </B> comes into contact with the ninth conductive segment of switch 40, the relay not <B> to </B> not <B> 701 </B> is neutralized and the counter relay <B> 01 </B> is <B> </B> excited.

    The latter by attracting its right armature closes the following circuit: the earth, the battery, the motor electromagnet of the combiner <B> 700, </B> the driver <B> 71 '3, </B> the left serial contact <B> 884, </B> the driver <B> 715, </B> the right armature and the counter relay contact <B> 0 ', </B> the right serial contact <B> 706, </B> <U> the </U> driver <B> 707, ' </B> the right serial contacts 512, the right armature and the working contact of the 51t relay and the earth.

   The combiner <B> 700 </B> from his third <B> to </B> its fifth position, and as soon as it leaves this third position, the circuits of the counter relays are opened at the left serial contact <B> 706. </B> The counter relay <B> 0 ' </B> also opens <B> to </B> under the left armature the excitation circuit of the.

         #relay <B> 903. </B> This one however remains excited -until the broom <B> 39 </B> rubs on the fourth isolated segment of switch 40. <B> A </B> - at this time, brushes 44, 45 and 46 are <B> con- </B> Nected with the lower set-binds of the ninth group 'terminals of the second section of the district selector terminal bank.

    -The 90Ô relay is neutralized and by its left armature opens the circuit <B> of </B> the vertical electromagnet and closes the circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the upper left serial contact <B> S6, </B> driver 415, top serial contact 424, driver <B> 961, </B> the left middle armature, and the relay contact <B> 930, </B> the lower serial contact <B> 921, </B> the left armature and the rest contact of the relay <B> 903, </B> and the earth.

   The combinator <B> 10 </B> then moves from its sixth <B> to </B> its -seventh position.



  This description of the work of the district reader shows that the line relay <B> 903 </B> for the control of this switch is associated with the circuit of the researcher <B> -de </B> cords, and therefore is coin- .man <B> to </B> all district selectors that are individual <B> to </B> the position <B> of </B> the operator, Since the number of cord seekers is less than the total number of cords, the total number of line relays is also less than the total number of district selectors.



  The combiner <B> 10 </B> in its tenth position lei-me the circuit passing through the earth, the battery, the electromagnet motor of the Combiner <B> 900, </B> the driver <B> 920, </B> the lower right serial contact <B> 932, </B> the driver <B> 960, </B> the left outer frame and contact <B> of </B> relay <B> 930, </B> driver 413, top serial contact 422, driver <B> 35, </B> the lower serial contact 34, and the earth. The combiner <B> 900 </B> thus passes from its tenth <B> to </B> his eleventh position.



  The combiner <B> 900 </B> in its eleventh position closes the circuit passing through the earth, the battery, the left winding of the relay <B> 903, </B> the upper right serial contact <B> 939, </B> and the earth. Relay <B> 903 </B> is excited and completes a circuit passing through the earth, the battery, the electromagnet motor of the combiner <B> 900, </B> the left serial contact <B> 907, </B> the driver <B> 908, </B> the left armature and the contact of the relay <B> 903, </B> and the earth, which brings the combiner <B> 900 </B> of his eleventh <B> to </B> his twelfth position.

   Relay <B> 903 </B> also closes a blocking circuit passing through the earth, the battery, the right winding of the relay <B> 903, </B> the top serial contact <B> 909, </B> the right armature and the working contact of the relay <B> 903, </B> the upper left serial contact <B> 910, </B> the inner left armature and the relay contact <B> 930, </B> the driver <B> 935, </B> the upper serial contact 428, the conductor <B> 37, </B> the lower serial contact <B> 25, </B> and the earth.

   When the combiner <B> 900 </B> reaches its twelfth position, one circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the top serial contact <B> 26, </B> the right armature and the relay contact <B> 7, </B> the driver <B> 27, </B> the upper serial contact 420, the conductor 411, the outer right hand rear and the relay contact 924, the conductor <B> 959, </B> the lower left serial contact <B> 915, </B> the driver 908, the left frame,

   and the working contact of the relay <B> 903, </B> and the earth. The coin-cultivator <B> 10 </B> from his seventh <B> to </B> his eighth position. If the junction line with which all the brushes 47, 48 and 49 are in contact is occupied, the relay <B> 903 </B> remains excited on the circuit above plotted <B> to </B> through the driver <B> 37, </B> the lower right serial contact 25, the driver <B> 76, </B> resistance <B> 52, </B> the test brush 44, the test terminal 47, and the earth through Him serial contact similar to the contact <B> 18. </B> For the eighth position <B> of </B> combiner <B> 10, </B> a circuit is closed <B> to </B> through the earth, the battery,

   the winding of the vertical motor electromagnet <B> 28, </B> the lower right serial contact 14, the conductors <B> 13 </B> and <B> 27, </B> and earth via the left armature and the relay contact <B> 903, </B> and the circuit described above.



  Like the rod <B> 31 </B> moves upwards under the control of the electromagnet <B> 28, </B> the brush 44 rubs on the terminals 47, and as long as it encounters occupied terminals, the relay <B> 903 </B> is excited. On the contrary, if terminal 47 of a free junction line is found, no earth being connected to the relay <B> 903, </B> this is neutralized and opens the circuit of the electromagnet <B> 28. </B> However this electromagnet remains energized as long as the brushes are not exactly centered on the terminals of the junction line chosen as a result of the circuit passing through the earth, the battery, the rolling <B> of </B> the electromagnet <B> 28, </B> the right serial contact 14, the broom <B> 50, </B> the switch <B> 51,

   </B> the upper right serial contact 34, the driver <B> 35, </B> and the earth through the ai-mature <B> of </B> left and <B> of </B> relay working contact <B> 903, </B> and the cooked circled above. As soon as the brushes 44, 45 and 46 are centered on the terminals 47, 48 and 49, the relay <B> 903 </B> is neutralized, and a circuit is formed <B> to </B> through the earth, the battery, the combiner electromagnet <B> 10, </B> the upper left serial contact <B> 36, </B> the conductor 415, the upper serial contact 424, the conductor <B> 961, </B> the left middle armature and the relay contact <B> 930,

   </B> it is actually lower serial <B> 921, </B> the left frame and <B> le </B> rest contact <B> 903 </B> and the earth. The combiner <B> 10 </B> pass from his eighth <B> to </B> his tenth position. A circuit is <B> to </B> now closed by the earth, the upper left s6rial contact <B> 18, </B> resistance <B> 52, </B> the brush 44, the terminal 47, and the multiple in order to prevent the connection by another selector ' <B> of </B> line districts <B> dice </B> junction chosen.



  The combiner <B> 10 </B> in its tenth position closes the following circuit <B>: </B> the earth, the battery, the resistance " <B> 53, </B> the top serial contact <B> 25, </B> the driver <B> 37, </B> the upper serial contact 428, the conductor <B> 935, </B> the left interior mature ar and the relay contact <B> 930, </B> the upper left serial contact <B> 910, </B> the right armature and the relay rest contact <B> 903, </B> the upper right serial contact 964, the winding of the re lais <B> 965, </B> and the earth.

   Relay <B> 9 65 </B> is excited and closes a circuit passing through the earth, the battery, the motor electromagnet of the combi- nator <B> 900, </B> the driver <B> 920, </B> the upper right serial cost <B> 907, </B> the outer left armature and the working contact of -relay- 965, the driver <B> 963, </B> the armature on the right and the rest contact of relay 937Y the upper serial contact on the left <B> 939, </B> and the earth. The combiner <B> 900 </B> from its twelfth <B> to </B> his thirteenth position.

   The 965 relay closes by its left armature its blocking circuit passing through the earth, the battery, and the upper serial contact. <B> 25. </B>



  For the ten positions of the combiner <B> 10, </B> thirteen of the combiner <B> 900, </B> twelve <B> -of </B> combiner <B> 500, </B> and twelve of the combiner <B> 800, </B> the following circuit is completed <B>:

   </B> earth battery, relay winding <B> 8, </B> the upper serial contact <B> 16, </B> the outer right armature and the working contact of the relay <B> 15, </B> the driver <B> 17, </B> the upper serial contact 14, the conductors <B> 13 </B> and <B> 27, </B> the upper serial contact 420, the conductor 411, the outer frame on the right and the relay contact 924, the conductor <B> 959, </B> the upper serial contact <B> 970, </B> the inner right armature and the relay contact <B> 965, </B> the driver 946, <B> the </B> broom 945, terminal 944,

   the 508j driver the lower serial contact <B> 'of </B> left <B> 507, </B> the driver <B> - 833, </B> the * lower right serial contact <B> 875, </B> and the 'earth.' The relay- <B> .8 </B> being excited opens the circuit of the release <B> 11, </B> which by its neutralization causes <B> to </B> in turn that of relays 14 and <B> 15. </B> The latter opens the circuit <B> of </B> relay <B> 8 </B> and closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the_ driver <B> 58, </B> the lower left serial contact <B> 59,

   </B> the outer right hand armature and the rest contact of the relay, <B> 15, </B> and the earth, through the circuit originally described. The combiner <B> 10 </B> goes from his tenth <B> to </B> his eleventh position.



  As soon as the combiner <B> 10 </B> leaves its tenth position, the relay blocking circuit <B> 965 </B> is open to higher serial contact <B> 25. </B> -The- relay <B> 965 </B> is neutralized and closes a circuit 'passing through the earth, the battery, the electromagnet motor of the combiner <B> 900, </B> the driver <B> 920, </B> the upper left serial contact <B> 07, </B> the outer left armature and the rest contact of relay 965, conductor -963 ,. serial contacts,

  lower ux 96-2 ,. and the earth. The combiner <B> 900 </B> spends its twelfth <B> to </B> his fourteenth position. <I> Disconnecting from the </I> The operator. When relay 14 is neutralized, the attendant set is automatically eliminated. <B> of </B> -chosen cord circuit, if this operator has not <B> already </B> disconnected his set by- activating his key - breaking listening <B> - 81. </B>



  We now consider the following way in which the attendant can connect to or disconnect from the co-immunization line. By lowering the listening key <B> 80, </B> it closes a circuit for the relay <B> 11 to </B> through- earth, battery ,. the armature and the NC contact of the relay <B> 8, </B> resistance <B> 9, </B> roll up the relay <B> 11, </B> the upper serial contact 12, the key and the earth.

   The excitement of the relay <B> he </B> causes the closure of its blocking circuit above traced <B> to </B> through the rewinding of relay 14. The latter, by attracting its frame, connects the operator's station to the; desired bead circuit. When the operator wants to disconnect from this circuit, cordQn, she lowers the break key <B> 81 </B> thus closing a circuit <B> to </B> through the earth, the battery, the winding of the relay <B> 8, </B> the <B> key 81 </B> and the earth. The excitement of the relay <B> 8 </B> causes the one <B> of </B> relay 14, <B> this </B> which disconnects the operator's set from the cord circuit.



  If the attendant must disconnect her set before having dialed the number requested on her key table, the operation is carried out as follows: From the previous description, it should be observed that after the cord finder <B> A </B> has found the desired cord, and the sender selector has connected a free voyeur, the corubineur <B> 900 </B> remains in its seventh position until the combiner <B> 500 </B> also occupies its seventh position, that is, until the office recorders are all in place.

   So the combinator <B> 10 </B> remains in its second position, since the circuit of this combiner is only closed when the combiner <B> 900 </B> reached its eighth position.



  If the operator activates his <B> key </B> listening break before she completed the number requested on her key table, release it <B> 11 </B> is neutralized in the usual way, and completes the circuit passing through the earth, the battery, the lamp <B> 83, </B> resistance 84, the upper serial contact <B> 85, </B> the external armature and the rest contact of the relay <B> 11, </B> the driver <B> 87, </B> the switch <B> 86, </B> and earth, which causes the lamp to ignite <B> 83. </B> The operator is therefore warned that she has not lowered the keys and can complete this operation on her table. The connection is then established as before.

       <I> Selection of brushes </I> bw-waters. For the eleven position of the combiner <B> 10 </B> and position fourteen of the combiner <B> 900, </B> the fundamental circuit is still established but <B> to </B> present it includes the earth, the battery, the bearing of the relay <B> 101 </B> (fig. 2) the lower serial contact 102, the conductor <B> 103, </B> terminal 49, brush 46, upper right and lower left serial contacts 54, conductors <B> 38 </B> and 415, the upper serial contact 424, the driver <B> 961, </B> the left middle frame and <B> the </B> relay working contact <B> 930,

   </B> the upper right contact <B> 921, </B> the driver 954, the broom <B> 955, </B> the terminal <B> 956, </B> the driver <B> 957, </B> the serial contact <B> 950, </B> the driver <B> 819, on </B> upper right serial contact <B> 820, </B> the driver <B> 821, </B> the left armature and the counter relay contact <B> 0 ', </B> the relay winding not <B> to </B> not <B> 701, </B> the top serial contact <B> 702, </B> resistance <B> 703, </B> and the earth.

   The relays <B> 701 </B> and <B> 101 </B> are energized, and the first of these closes a circuit passing through the earth, the battery, the winding of the 4 meter relay, the armatures and the rest contacts of the relays 41 and 704, have -mature and working contact of the relay <B> 701 </B> and the earth. Counter relay 4 is energized and prepares a circuit for counter relay 41 in the well known manner.



  Relay <B> 101 </B> closes by its ai-mature on the right its blocking circuit passing through the earth, the battery, the relay winding <B> 101, </B> the right armature and the working contact of the relay <B> 101, </B> the top serial contact 102, and the earth <B> to </B> through the fundamental circuit described. Relay <B> 101 </B> also closes a circuit passing through the earth, the battery, the winding of the stop relay 104, the serial contact <B> 105, </B> the left armature and the contact of the relay <B> 101, </B> and the earth.

   The relay 104 by its left armature closes its blocking circuit comprising <B>: </B> the earth, the battery, the winding of the relay 104, the left armature and the working contact of the relay 104, the resistance <B> 106, </B> the driver <B> 107, </B> terminal 47, brush 44, resistance <B> 52, </B> the upper left contact <B> 18, </B> and the earth. Relay 104 by its armature <B> of </B> right closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 100, </B> the lower serial contact <B> 108, </B> the armor <B> of </B> right and the working contact of relay 104 and earth.

   The combiner <B> 100 </B> from its first <B> to </B> its second position.



  For this last position, the following circuit is formed; earth, battery, winding of the vertical electromagnet <B> 109, </B> the <B> con- </B> lower right serial tactic <B> 110, </B> the driver <B> 111, </B> the left armature and the working contact of the relay <B> 101, </B> and the earth. The brush holder rod 112 moves upwards and closes a circuit for the relay <B> 101 </B> including <B>: </B> earth, battery, relay winding <B> 101, </B> the right armature and the working contact of the relay <B> 101, </B> the driver <B> 113, </B> the lower serial contact 114, the conductive segment <B> 115, </B> the broom <B> 116, </B> and the earth.

   Whenever this circuit is closed, the relay <B> 701 </B> is bypassed, which causes <B> the </B> operation of counter relays in the well-known manner.



  *As soon as <B> the </B> broom <B> 116 </B> comes into contact with the first isolated segment of the switch <B> 115, </B> counter relay 41 is energized and the following circuit is closed <B>: </B> the earth, the battery, the winding of the meter relay <B> 01, </B> the upper right serial contact <B> 712, </B> the driver <B> 711, </B> the lower right serial contact <B> 710, </B> the driver <B> 725, </B> serial contact <B> 726, </B> the driver <B> 727, </B> the armatures and the working contacts of relays 549 and 551, the internal armature and the contact of r <B>. </B> relay 650 clicks,

      the driver <B> 709 </B> (fig. <B> 15 </B> and <B> 13) </B> the lower serial contact <B> 708, </B> the armatures and the working contacts of relay 41, rest of relay 704, and working of relay <B> 701, </B> and the earth. When the broom <B> 116 </B> comes into contact with the next conductor segment, the relay <B> 701 </B> is neutralized and the counter relay <B> 01 </B> is excited. The latter by attracting its left armature opens the fundamental circuit causing the neutralization of the relay. <B> 101 </B> as soon as the broom <B> 110 </B> reaches the second isolated segment.

   Relay <B> 101 </B> opens <B> to </B> its left armature the circuit of the electromagnet <B> 109 </B> and closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 100, </B> the upper right serial contact <B> 108, </B> the left armature and the rest contact <B> of </B> relay <B> 1.01, </B> and the earth. The combiner <B> 100 </B> from his second <B> to </B> his third position. The counter relay <B> 01 </B> also closes the above circuit drawn for the motor electromagnet <B> of the com </B> weeder <B> 700, </B> which passes from its fifth <B> to </B> his seventh position.

   As soon as <B> this </B> combiner <B> 700 </B> has abandoned its fifth position, the relay blocking circuit is open at the upper left serial contact <B> 706. </B>



  For the seventh position of the combiner <B> 700, </B> a circuit is closed passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the upper left serial contact <B> 591, </B> driver 794, the left serial contact <B> 850, </B> the driver <B> 731, </B> the top serial contact <B> 732, </B> and the earth. The combiner <B> 500 </B> from his twelfth <B> to </B> its fifteenth position.



   <I> Selection of </I> groups, of <I> offices. </I>



  For position three <B> of </B> combiner <B> 100 </B> and position seven of the combiner <B> 700, </B> the fundamental circuit traced above is still closed, and the relays <B> 101 </B> and <B> 701 </B> are excited. Relay <B> 101 </B> by its right armature closes its blocking circuit <B> to </B> through the 'fundamental circuit, and by its left armature closes the circuit passing through the earth, the battery, the electromagnet motor of the combiner <B> 100, </B> the lower serial contact 122, the conductor <B> 111, </B> the left armature and the contact said relay <B> 101, </B> and the earth.

   The combiner <B> 100 </B> then passes from his third <B> to </B> his fourth position.



  For the seventh position of the combiiieur <B> 700 </B> a circuit is closed <B> to </B> through the earth, the battery, the winding of the relay 704, the upper left serial contact <B> 719, </B> the driver <B> 733, </B> the outer right armature and the relay contact <B> 557, </B> the driver <B> 827, </B> le, serial contact <B> 828, </B> and the earth. When the relay <B> 701 </B> is energized as a result of the closing of the fundamental circuit, a circuit is completed <B> to </B> through earth, battery, counter relay winding <B> 9, </B> the armatures and the counter relay rest contacts <B> 91, </B> relay 704 working and -relay not working <B> to </B> not <B> 701, </B> and the earth.

   Relay <B> 9 </B> pre pare titi circuit for the relay <B> 91 </B> in the well-known manner.



  For the fourth position of the combiner <B> 100, on </B> circuit drawn above for the electromagnet <B> 109 </B> is still closed and the rod 12 moves towards <B> the </B> top. The second set of brushes is triggered by the electromagnet <B> 119, </B> which one is excited <B> to </B> through the following circuit <B>: </B> the earth, the battery, the winding of the electromagnet <B> 119, </B> the upper right serial contact 120, and land.

   Every ëols that the broom <B> 116 </B> comes into contact with a conductive segment of the switch <B> 118 </B> during <B> the </B> movement of the rod 112, a eu> - cooked. is closed passing through the earth, the battery, the relay winding <B> 101, </B> the right armature and the relay contact <B> 101, </B> the driver <B> 113, </B> the top serial contact <B> 114, </B> the switch <B> 118, </B> the broom <B> 116, </B> and the earth. This circuit bypasses the coil winding <B> 701 </B> which is neutralized, which in the well-known manner causes the successive operation of the counter relays.

   When the ba lai <B> 116 f </B> rotte on the fifth isolated segment, _ a circuit is closed <B> to </B> through earth, battery, counter relay winding <B> 0, </B> the upper right serial contact <B> 712, </B> the driver <B> 711, </B> the top serial contact <B> 720, </B> the driver 734, the serial contact <B> 735, </B> the driver <B> 736, </B> frames and contacts <B> of </B> rest of relays 554 and 547, the driver <B> 737 </B> (fig. <B> 15 </B> and <B> 13), </B> the lower serial-contact <B> 755, </B> the armatures and working contacts of the meter relays <B> 51 to 91 </B> inclusive,

   the ar matures and the NO contacts of the 704 relays and <B> 701, </B> and the earth. When <B> the </B> arm <B> 116 </B> passes through the conductive segment following the counter relay <B> 0 ' </B> is excited and opens the fundamental circuit drawn above. Relay <B> 101 </B> is neutralized as soon as the broom <B> 116 </B> goes through the next isolated segment, and by its left armature this relay opens on the one hand the circuit of the electromagnet 109, and on the other hand closes the circuit passing through the earth, the battery, the combiner motor electromagnet <B> 100, </B> the serial contact. of right <B> 108, </B> Parmature <B> of </B> left and the rest contact of the relay <B> 101, </B> and the earth.

   The combiner <B> 100 </B> pass from his fourth <B> to </B> its seventh position. The second set formed by the brushes <B> 123, </B> 124 and <B> 125 </B> of the rod 112 is now in contact with the most <B> - </B> low terminals <B> 126, 127 </B> and <B> 128 </B> of the sixth group served by this set.



  For the seventh position of the combiner <B> 100 ' </B> a circuit is closed <B> to </B> through the earth, the battery, the left coil of the relay 121, the lower serial contact 120, and the earth. The relay 121 by its excitation closes the circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 100, </B> the upper right serial contact 122, the left armor and the working contact of relay 121, and earth. The combiner <B> 1.00 </B> from his seventh <B> to </B> his ninth position.

    If the junction line associated with the terminals <B> 126, 127 </B> and <B> 128 </B> is busy, the test terminal <B> 126 </B> is connected <B> to </B> the mother earth described below, and the blocking circuit for relay 121 is closed <B> to </B> through the earth, the battery, the right winding of relay 121, the armature. on the right and the working contact of this relay, the test brush <B> 123, </B> the test terminal <B> 126, </B> and the earth. For the ninth position of the combiner <B> 100, </B> a circuit is closed by the earth, the battery, the winding of the electromagnet <B> 109, </B> the superior serial con tact <B> 110, </B> the left armature and the working contact of relay 121, and the earth.

   Under <B> the </B> control of the electromagnet <B> 109, </B> brushes 123, 124 and <B> 125 </B> move around the bounds of the chosen group, until a free set is found. <B> A </B> At this moment, the circuit of relay 121 is open due to the absence of earth on the terminal <B> 126, </B> and this relay opens the circuit of the electromagnet <B> 109. </B> It also closes a fired circuit passing through the earth, the battery, the electro-magnet motor of the combiner <B> 100, </B> the left serial con tact <B> 122, </B> the left armature and the rest contact of relay 121, <U> and </U> the earth.

   The combiner <B> 100 </B> then moves from its ninth <B> to </B> his sixteenth position.



  When <B> the </B> counter relay <B> 01 </B> is excited <B> to </B> Following the selection movement of the office selector, a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 700, </B> the driver <B> 718, </B> the serial contact. <B> of </B> left <B> 884, </B> the cç) iidue- teur <B> 715, </B> Right hand side and counter relay contact <B> 0 ', </B> the driver <B> 769, </B> the left serial contact <B> 770, </B> the driver <B> 795, </B> the upper serial contact 594, * and the earth.

   The combiner <B> 700 </B> from his seventh <B> to </B> its eighth position, which neutralizes the counter relays and the relay <B> 701. </B> In addition, the following circuit is closed <B>: </B> the earth, the battery, 700, the conductive electromagnet 713, motor the contact of the lower combiner serial <B> - </B> right laugh,

       Parmature and the rest contact of the relay <B> 719, </B> and the earth. The combiner <B> 700 </B> pass from his eighth <B> to </B> his ninth position. <I> Selection of arrival brushes. </I>



  For position fourteen of the combiner <B> 100 </B> and position nine <B> of </B> co mbineur <B> 700, </B> the fundamental circuit is still closed <B> to </B> through earth, battery, right winding of relay <B> 151 </B> (fig. <B> 3) </B> the lower serial contacts <B> 152, </B> the resistor 163, the -conductor 154, the terminal <B> 128, </B> the broom 125, the serial contact <B> 130, </B> the driver <B> 103, </B> the circuit originally described, the serial-lower contact <B> 702, </B> driver 740,

   the upper left serial contact <B> 851, </B> the conductor 742, the terminal <B> 966, </B> the broom <B> 967, </B> the driver <B> 968, </B> the lower serial contact 934, the left inner rear and the relay contact <B> 030, </B> the driver <B> 935, </B> the upper serial contact 428, the conductors <B> 37 </B> and 43, the upper left and lower right serial contacts 42, the brush 45, the terminal 48, the conductor <B> 131, </B> serial contact <B> 132, </B> the broom 124, the terminal <B> 127, </B> the driver <B> 155, the </B> left serial contact <B> 156,

   </B> the resistance <B> 157, </B> and the earth. The relays <B> 151 </B> and <B> 701 </B> are excited and the last of these closes by its armature a circuit comprising the earth, the battery, the winding of the counter 4 relay, the armatures and the rest contacts of relay 41, working relays 704 and <B> 701, </B> and the earth. Counter relay 4 is energized and prepares a circuit for <B> the </B> 4 'counter relay as described.



  By its -left armature, the relay al closes its blocking circuit comprising <B> the </B> earth, <B> there </B> battery, the right winding of the relay <B> 151, </B> the contact, higher serial <B> 158, </B> the left armature and the working contact of the relay <B> 151, </B> the lower serial contact - 159, resistor 153, the fundamental circuit. and the earth.

   Relay <B> 151 </B> still closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the lower left serial contact <B> 160, </B> the conductor 164, the right armature and the working contact of the relay <B> 151, </B> and the earth, which brings the combiner <B> 150 </B> of <U> his </U> first <B> to </B> its second position.



  By this second position of the combiner <B> 150, </B> a circuit is completed <B> to </B> through the earth, the battery, the winding of the vertical electromagnet <B> 162, </B> the lower serial contact <B> 163, </B> the conductor 164, the right armature and the working contact of the relay <B> 151, </B> and the earth. The electromagnet <B> 162 </B> causes by its frame the vertical movement of the rod <B> 165 </B> in the ordinary way.

   Every time the broom <B> 168 </B> comes into contact with a conductive segment of the switch <B> 167, </B> a circuit is closed <B> to </B> through the earth, the battery, the right winding of the relay <B> 151, </B> the upper serial contact <B> 158, </B> the left frame and the working contact <B> of </B> relay <B> 151, </B> lower serial contacts <B> 159, 152 </B> and <B> 166, </B> the switch <B> 167, </B> the broom <B> 168, </B> lower serial contacts <B> 169, </B> and the earth. This circuit places a shunt around the relay not <B> to </B> not <B> 701, </B> which causes the counter relays to function in the well known manner.

   When the broom <B> 168 </B> makes contact with the first isolated segment, after counter relay 41 is energized, a circuit is closed <B> to </B> through the earth, the battery, the wind up <B> of </B> counter relay <B> 0, </B> the right-hand serial contacts <B> 712, </B> the driver 744; the left armatures and the contacts. working relays <B> 561 </B> and 564, the internal left armature and the normally closed contact of the relay <B> 562, </B> the driver <B> 709 </B> (fig. <B> 16 </B> and <B> 13) </B> the lower serial contact <B> 708, </B> frames and working contacts <B> of </B> relay 41, rest of relay 704 and working of relay <B> 701, </B> -and the earth.

   When the broom <B> 168 </B> rubs on the second conductive segment <B> of </B> coin- mutator <B> 167, </B> the relay <B> '101 </B> is neutralized and the relay counts- <B> 0 ' </B> is excited.



  This counter relay <B> 01 </B> then closes the circuit fired above drawn for the electrical-ainiant mo- all of the combiner <B> 700 </B> and this one passes from its ninth <B> to </B> his eleventh position. The counter relay <B> 01 </B> by its left armature also closes the fundamental circuit above traced bringing the neutralization of the relay <B> 151, </B> as soon as the broom <B> 168 </B> passes over the neighboring isolated segment.

   Relay <B> 151 </B> opens <B> to </B> its right armature the Feledro- motor magnet circuit <B> 162 </B> and closes a cooker passing by the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the serial contact] on the right <B> 160, </B> the driver <B> 161, </B> the right armature and the rest contact of the relay <B> 151, </B> and the earth.

   The combiner <B> 150 </B> from his second <B> to </B> its third position, and then the next circuit is closed <B>: </B> the earth, the battery, the winding of the control electromagnet <B> 170 </B> serial contact <B> 171, </B> and the earth. The electromagnet <B> 170 </B> is excited and places the rod <B> 175 </B> so <B> to </B> release the second set of brushes from the arrival selector, as soon as the rod <B> 165 </B> is moved up again.



   <I> Selection of arrival groups. </I>



  For position three of the combitieur <B> 150, </B> and the eleven position of the combiner <B> 700, </B> The fundamental cooked oit above plotted is non-closed, causing the relays to be energized. <B> 151 </B> and <B> 701. </B> The latter closes the circuit of the counter relay 4, which prepares a circuit for the counter relay 4 '.

   The left armature of the relay <B> 151 </B> completes either blocking circuit, and also closes the circuit comprising the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the serial contact of the left <B> 160, </B> the conductor 164, the right-hand ai-mature and the relay contact <B> 151, </B> and the earth.

   The combiner <B> 150 </B> from his third <B> to, </B> its fourth position for which the circuit of the vertical motor electromagnet is closed again, which sets in motion upwards, the broom <B> 165. </B> During this movement, ni) circuit is closed each time the broom <B> 173 </B> rub on a conductive segment of the switch <B> -172. </B> This circuit includes the earth, the battery, the relay blocking cir cuit <B> 151, </B> the lower left serial contacts <B> 152, </B> and above <B> 166, </B> the switch <B> 172, </B> the broom <B> 173, </B> lower serial contacts <B> 169 </B> and the earth.

    This circuit places a shunt around the coil of the relay not <B> to </B> not <B> 701. </B> The counter relays are actuated in the ordinary way, until the counter relay <B> 31 </B> is "excited. Therefore, as soon as the relay <B> 701 </B> attracts its armatures, a circuit is closed <B> to </B> through earth, battery, counter relay winding <B> 0, </B> the upper right serial contacts <B> 712, </B> and left 743, <B> the </B> conductor 74.5, the left armatures and the working contacts of the relay <B> 567, </B> and relay rest <B> 575, </B> conductor 746 (fig. <B> 16 </B> and <B> 13), </B> the lower serial contact <B> 747,

   </B> the armatures and the rest contacts of the counter relays 31 and 41, the armatures and the rest contacts of the relay 704 and working contacts of the relay <B> 701, </B> and the earth.

   The counter relay <B> 0 </B> is excited and prepares a circuit for the release <B> 01. </B> As soon as the broom <B> 173 </B> makes contact with the conductive segment following the relay not <B> to </B> not <B> 701 </B> is energized and causes the energization of the counter relay <B> 01, </B> who <B> to </B> in turn closes the circuit of the motor electromagnet of the combirieur <B> 700 </B> to move this one from its eleventh <B> to </B> his thirteenth position.

   Relay <B> 01 </B> opens the fundamental circuit neutralizing the relay by its left armature <B> 151, </B> The latter <B> to </B> its turn by its left armature opens the circuit of the vertical motor electromagnet <B> 162, </B> and closes a circuit comprising the earth, the battery, the motor electromagnet of the combirieur <B> 150, </B> the lower right serial contact <B> 160, </B> the driver <B> 161, </B> The frame on the right and the break contact of the relay <B> 151, </B> and the earth. The combiner <B> 150 </B> pass from his fourth <B> to </B> its fifth position.

   The second set of brooms <B> 182, </B> <B> 185 </B> and <B> 177 </B> of the arrival selector is now in contact with the lowest row of terminals of the third group served. For the fifth position <B> of </B> combiner <B> 150, </B> a circuit is closed <B> to </B> through the earth, the battery, the winding said relay <B> 151, </B> serial contacts <B> of </B> right <B> 152, </B> and the earth.

    Relay <B> 151 </B> is energized and closes either blocking circuit passing through the earth, the battery, the left winding of the relay <B> 151, </B> the lower serial contact <B> 158, </B> the left armature and the contact of the relay <B> 151, </B> <B> the </B> upper right serial contact <B> 159, </B> the conductor 174, the resistance <B> 176, </B> the test broom <B> 177 </B> and the earth <B> to </B> through the test terminal <B> 178 </B> provided that this terminal is in an occupancy condition in the manner <B> de- </B> written above.

   Relay <B> 151 </B> closes by its right armature a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the left serial contact <B> 160, </B> the conductor 164, the right armature and the relay contact <B> 151, </B> and the earth. The combiner <B> 150 </B> from his fifth <B> to </B> his sixth position.



  For this last position, <B> the </B> motor electromagnet circuit <B> 162 </B> is closed communicating <B> to </B> the rod <B> 165 </B> an as-censal movement provided that the relay blocking circuit <B> 151 </B> be closed. As long as the test broom <B> 177 </B> meets test terminals <B> 178 </B> of busy trunk lines, the relay blocking circuit <B> 151 </B> is being kept closed.

    As soon as a free junction line is pierced, this circuit is opened due to the absence of earth on the test terminal. <B> 178 </B> correspondent, but the relay <B> 151 </B> is maintained. excited on the next circuit until the brushes are exactly centered on the set of selected terminals <B>: </B> the earth, the battery, the winding <B> of </B> right of the relay <B> 151, </B> the lower right serial contacts 152 and higher <B> 166, </B> the switch <B> 180, </B> the ba lai <B> 179, </B> the upper right serial contact <B> 163, </B> the conductor 164, the right armature and the working contact of the relay <B> 151 </B> and the earth.

   As soon as the brushes are centered, this fired circuit is OU7ert by the brush <B> 179 </B> in contact with an isolated segment of the switch <B> 178. </B> The relay <B> 151 </B> is therefore neutralized and opens the motor electromagnet circuit <B> 162, </B> while on the other hand it closes the circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the right contact <B> 160, </B> the driver <B> 161, </B> the right armature and the rest contact of the relay <B> 151, </B> and the earth. The combiner <B> 150 </B> then goes from his sixth <B> to </B> his eighth position.



  For the 6/4 position of the combiner <B> 150, </B> the earth is connected <B> to </B> the test bot <B> 178 to </B> through the following circuit - earth, the lower left and upper right serial contacts <B> 169, </B> resistance <B> 176, </B> the broom <B> 177, </B> -and the terminal <B> 178 </B> to place the terminals <B> 181, </B> <B> 186 </B> and <B> 178 </B> in a busy condition vis-à-vis the other arrival selectors.



   <I> Brush selection </I> firials.



  For the eight position of the combiner <B> 150, </B> and the thirteen position of the combiner <B> 700, </B> the fundamental circuit is closed, causing the excitation of. relay <B> 151 </B> and <B> 701. </B> The latter is excited and closes the circuit of counter relay 4, which prepares a circuit for relay 41.

   The left armature of the relay <B> 151 </B> also closes the blocking circuit of this relay, while the armature on the right completes the following circuit <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the left serial con tact <B> 160, </B> the conductor 164, the right armature and the working contact of the relay <B> 151 </B> and the earth.

   The combiner <B> 150 </B> pass from his eighth <B> to </B> its ninth position for which the following circuit is realized <B> - </B> the earth, the battery, the windings of the relay 202 in series, the left contact <B> 203, </B> the conductor 204, the terminal <B> 181, </B> the ba lai <B> 182, </B> the driver <B> 183, </B> the upper left serial contact <B> 163, </B> the conductor 164, the right armature and the working contact of the relay <B> 151, </B> and the earth.

   The relay 202 by its right armature completes its blocking circuit passing through the earth, the battery, the windings of the relay 202 in series, the upper contacts <B> 205, </B> the right armature and the working contact of relay 202, the serial -contact. lower right <B> 203, </B> the circuit originally described, and the earth. Relay 202 closes the circuit by its left armature, comprising <B>, </B> the earth, the battery, the winding of the relay <B> 206, </B> the lower serial contacts <B> of </B> left and upper right <B> 207, </B> the left armature and the working contact of relay 202, and the earth.

    Relay <B> 206 </B> being energized, closes its blocking circuit passing through the earth, the battery, the relay winding <B> 206, </B> the right armature and the working contact of this relay resistor <B> 208, </B> the driver <B> 209, </B> the terminal <B> 178, </B> the broom <B> 177, </B> resistance <B> 176, </B> the upper right and lower left serial contacts <B> 169, </B> and the earth. Relay <B> 206 </B> also closes a circuit passing through the earth, the battery, the motor electromagnet of the combireur 200, the upper right serial contact 210, the left armature and <B> the </B> relay working contact <B> 206, </B> and the earth.

    The combiner 200 passes from its first <B> to </B> its second position.



  For this the following circuit is closed the earth, the battery, the winding of the electromagnet 211, the conductor 212, the left serial con- tacts <B> 205, </B> the circuit <B> pri- </B> Mitively described, the armature on the right and the working contact of the relay <B> 151, </B> and the earth. The electromagnet 211 by attracting its armor presses the motor tape <B> 213 </B> against the wheel <B> to </B> continuous movement 214, which produces upward displacement of rod 215.



  As soon as the broom <B> 216 </B> passes on a conductive segment of the switch <B> 217, </B> the circuit is closed creating a shunt around the relay not <B> to </B> not <B> 701: </B> earth, battery, right winding of the relay <B> 151, </B> the superior sôrial contact <B> 158, </B> the left armature and the contact of the relay <B> 151, </B> lower serial contacts <B> 159, </B> 152 and <B> 166, </B> the driver 184, the broom <B> 185, </B> the terminal <B> 186, </B> the driver <B> 216, </B> the left serial contact <B> 217, </B> the driver <B> 218, </B> the top serial contact <B> 219, </B> the driver segment <B> 217, </B> the broom <B> 216,

   </B> and the earth. Neutralization of the relay <B> 701 </B> causes the ac tion of the counting relays in the manner <B> de- </B> written. <B> A </B> the continuation of the fifth relay excitation <B> 701, </B> a circuit is closed <B> to </B> through earth, battery, counter relay winding <B> 0, </B> the upper right and lower left serial contacts <B> 712, </B> the switch <B> 748, </B> the left armatures and the working contacts of the relay <B> 571, </B> relay rest <B> 573 </B> and relay work <B> 572, </B> driver 749 (fig. <B> 16 </B> and <B> 13), </B> the lower serial contact <B> 750, </B> the armatures and working contacts of the relays <B> 11 to </B> 41 inclusive,

   the armatures and resting contacts of relay 704 and working contacts of the relay <B> 701 </B> and the earth. When the broom <B> 216 </B> rubs for the fifth time on the driver's segment, the relay <B> 701 </B> is neutralized and the counter relay <B> 01 </B> is excited. This dei-denier by his arma- turk on the right closes the circuit of the electromagnet motor of the combiner <B> 700 </B> which passes from its thirteenth <B> to </B> his fifteenth position.



  Relay <B> 01 </B> opens the fundamental circuit with its left armature. Relay <B> 151 </B> is excited until the broom <B> 216 </B> passes on the neighboring isolated segment <B> to </B> the continuation of the circuit traced above. When the relay <B> 151 </B> is neutralized, the circuits of the electromagnet 211 and of the relay 202 are open, and a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the serial contact] on the right <B> 160, </B> the driver <B> 161, </B> the right armature and the rest contact of the relay <B> 151, </B> and the earth. The combiner <B> 150 </B> from his ninth <B> to </B> his tenth position.



  Relay 202 closes the following circuit <B> - </B> the earth, the battery, the electromagnet motor of the combincur 200, the lower right and upper left serial contacts <B> 207, </B> the mature ar on the left and the rest contact of relay 202, and the earth. The combiner 200 pass # then has its second <B> to </B> his third position.

       <I> Final selection of the tens. </I> For position 14 3/4 of the combiner <B> 700, </B> a circuit is closed <B> to </B> through earth, battery, winding of relay 704, conductor <B> 751, </B> the lower serial contact <B> 752 </B> the driver 753, the outer left armature and the relay contact <B> 581 ,. </B> and the earth. Relay 704 is energized and prepare a circuit for the counter relay <B> 9, </B> -which is closed as soon as the relay <B> 701 </B> is excited.



  For position ten of the combiner <B> 150 </B> and position fifteen of the combiner <B> 700, </B> the <B> Cir- </B> fundamental cooked is closed again <B>, </B> which produces the excitement of the relays <B> 151 </B> and <B> 701. </B> The latter completes the circuit of the counter relay <B> 9, </B> which <B> to </B> his turn prepares by his excited:

  tion the relay circuit <B> 91. </B> The relay <B> 151 </B> closes the circuit of the combiner motor electromagnet <B> 150, </B> and this last pass of his tenth <B> to </B> his eleventh position. <B> A </B> this moment, the relay 202 is energized and closes the circuit <B> of </B> the motor electromagnet of the combiner 200 which passes from its third <B> to </B> his fourth position.

   The relay 202 also closes its blocking circuit, and for the fourth position of the combiner 200, the motor electromagnet 211 receiving current, <B> de- </B> place the rod up <B> 215. </B> The fifth set of brushes is triggered by this second movement <B> to </B> the result of the excitation of the electromagnet 220 by the circuit comprising: the earth, the battery, the winding of the electromagnet 220, the serial contact 221, and the earth.

   During the upward movement of the rod <B> 215, </B> a circuit is closed for the release <B> 151 </B> at lower serial contact <B> 219 </B> and-through the conductive segment of switch 222, the brush <B> 223 </B> and the earth. The closing of this shunt results from successive neutralizations of the relay. <B> 701, </B> and the operation of the counter relay follows in the ordinary manner.



  The sixth excitation of the relay <B> 701 </B> completes the circuit passing through the earth, the battery, the relay winding <B> 0, </B> senior serial contacts <B> 712, the </B> conductor 754, the left armatures and the rest contacts of the relays <B> 577 </B> and <B> 579, on </B> driver <B> 737 </B> (fig. # <B> 16 </B> and <B> 18), </B> the lower serial contact <B> 755, </B> the armatures and working contacts of the counter relays <B> 5 'to 91 </B> inclusive, the frames and the working contacts of. relay 704 and <B> 701, </B> and the earth.

   As soon as the broom <B> 223 </B> goes to the next conducting segment of switch 222, the relay <B> 701- </B> is neutralized and causes the excitation of the counter relay <B> 01. </B> This one by its frame <B> of </B> right closes the circuit for the combiner <B> 700, </B> which passes from its fifteenth <B> to </B> its seventeenth position. The counter relays and relay 704 are then neutralized.



  The left armature of the relay <B> 01 </B> also opens the fundamental circuit. However the relay <B> 151 </B> is kept excited until the broom <B> 223 </B> come to the neighboring isolated segment. By its right armature, - this relay opens the circuits of the motor electromagnet 211 and of the relay 202, and closes the circuit of the motor electromagnet of the combiner <B> 150. </B> The latter thus passes from his eleventh <B> to </B> his twelfth pos <B> ' </B> ition. Relay 202, closes the circuit of the motor electromagnet <B>. </B> of the combiner 200 which goes from its fourth to its fifth position.

       <I> Final selection of units. </I> When the combiner <B> 700 </B> reaches its position 161/4, a circuit is closed <B> to </B> through <B> there </B> earth, battery, winding of relay 704, conductor <B> 751, </B> the higher serial cost <B> 752, </B> the driver <B> 75.6, </B> the outer left armature and the relay contact <B> 586, </B> and the earth.

   The relay 704 by its armature prepares a circuit for the counter relay <B> 9. </B> For the twelve positions of the combiner <B> 150 </B> and seventeen of the 7CrO combiner, the fundamental circuit is closed, and the relays <B> 151 </B> and <B> 701 </B> are excited, The latter completes the circuit of the counter <B> 9, </B> which as soon as excited prepares the relay circuit <B> 91. </B> The relay by its left armature closes its blocking circuit,

   and by its mature ar on the right closes the circuit of the motor electromagnet of the combiner <B> 150. </B> This one goes from his twelfth <B> to </B> its thirteenth position for which the relay 202 is energized closing its blocking circuit by its armature <B> of </B> right. In addition, # this relay- by its armature on the left closes the circuit of the motor electromagnet of the combiner 200, and this latter passes from its fifth <B> to </B> its sixth position.

   The following circuit is then closed <B>; </B> the earth, the battery, the winding of the vertical electromagnet 226, the conductor <B> 226, </B> the lower right and upper left serial contacts 206, the above circuit traced, the right armature and the working contact of the relay <B> 151, </B> and the earth. The electromagnet <B> 225 </B> presses tape 213 on the roll by its armature <B> to </B> slow continuous rotary motion <B> 227. </B> This causes the upward movement of the rod 216. Like the broom <B> 216 </B> passes successively on the conductive and insulated segments of the switch <B> 227, </B> one obtains successive neutralizations and excitations of the relays <B> 701. </B>



  On the seventh energization of the relay <B> 701, </B> a circuit is closed <B> to </B> through earth, battery, counter relay winding <B> 0, </B> the top right serial contacts <B> 712 </B> and lower 74 <B> - 3. </B> the driver <B> 758, </B> the gaüLhe reinforcements and the working contours of the relays <B> 583 </B> and <B> 585, </B> the inner left armature and the rest contact of relay 584, the driver <B> 709 </B> (fig. <B> 16 </B> and <B> 13), </B> the lower serial contact <B> 708, </B> the armatures and work contacts of the 4 'counter relays <B> to 91 </B> inclusive, the frames,

   and the working contacts of relays 704 and <B> 701, </B> and the earth.



   <B> A </B> the next neutralization of the relay <B> 701, </B> the counter relay <B> 01 </B> is excited and close to me by its right armature the circuit of the motor electromagnet of the combiner <B> 700. </B> This one goes from his seventeenth <B> to </B> its first position, which results in neutralizing the counter relays and relay 704. The left armature of the relay <B> 01 </B> opens the fundamental circuit, but the relay <B> 151 </B> is kept excited until the broom <B> 216 </B> arrives on the neighboring isolated segment. <B> - </B> Brooms <B> 228, 229 </B> and <B> 230 </B> are now exactly centered on terminals 231, 232 and 233 of the called line.

   Relay <B> 151 </B> closes the circuit of the igniter electromagnet <B> 150 </B> which passes from its thirteenth <B> to </B> his fourth position. By neutralizing the relay <B> 151, </B> the circuits of the motor electromagnet <B> 225 </B> and relay 202 are open, and the latter relay by abandoning its mature arrays closes the circuit allowing the combinator 200 to pass from its sixth <B> to </B> his seventh position. Restoring <B> <I> to </I> </B> the state <I> rest </I> <I> die finder of cords, said selector of senders, </I> <I> recorders and senders. </I>



  For the first position of the combiner <B> 700, </B> a circuit is closed <B> to </B> through the earth, the battery, the winding of the combiner motor electromagnet <B> 900, </B> the driver <B> 920, </B> the lower left serial contact <B> 932, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> drivers <B> 951 </B> and <B> 528, </B> the upper left serial contact <B> 529, the </B> driver <B> 760, </B> the lower right contact <B> 732, </B> and the earth. The combiner <B> 900 </B> from his fourteenth <B> to </B> his fifteenth position.

   The relay circuit <B> 511 </B> is open to higher serial contact <B> 953, </B> and this relay, being neutralized, closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the lower right serial contact 521, the mature right ar and the rest contact <B> of </B> relay <B> 511, </B> and the earth.

   The combiner <B> 500 </B> from his fifteenth <B> to </B> his seventeenth <B> Po- </B> sition, and therefore the blocking circuits of the recording relays are open to the serial contacts <B> 527. </B> For position eighteen of the combiner, a circuit is closed <B> to </B> through the earth, the battery, the electromagnet motor of the combiner <B> 500, </B> the lower serial contact <B> 591, </B> the driver <B> 760, </B> the lower right serial contact 73 '.), And the earth.

   The combiner <B> 500 </B> leaves his eighteenth position and returns <B> to </B> its normal position.



  For position fifteen of the combiner <B> 900, </B> the following circuit is closed6 <B>: </B> the earth, the bat terie, the motor electromagnet of the combiner <B> 10, </B> the lower left serial contact <B> 26, </B> <B> the </B> driver <B> 27, </B> the upper serial contact 420 # the combiner 411, the outer right armature and the relay contact 924, the coupler <B> 959, </B> the lower serial contact <B> 970, </B> and the earth.

   The combiner <B> 10 </B> passes from his eleventh <B> to </B> his thirteenth position. The blocking circuit of relay 924 is then opened at the upper left serial contact 24, and this relay, following its neutralization, closes a circuit passing through the earth, the battery, the motor electromagnet of the horn finder. 4, the . combiner 425, the upper left serial contact 426, the conductor 431, the upper left serial contact <B> 923, </B> the inner right armature and the rest contact of relay 924, and earth.

   The 425 combination goes from its fifth <B> to </B> its seventeenth position. For the latter, the following circuit is completed <B>: </B> the earth, the battery, the motor electromagnet of the combiner 900, the conductor 920, the upper right serial contact <B> 932, </B> the driver <B> 972, </B> the lower right serial contacts 452, and upper 427, and the earth.

   The combiner <B> 900 </B> from his fifteenth <B> to </B> its sixteenth position. <B> A </B> At this time, the following circuit is shoed :. earth, battery, winding of the electromagnet <B> 979 </B> the lower right serial contact 953, and the earth. The electromagnet <B> û79 </B> by its frame presses the tape <B> 973 </B> against the pulley <B> to </B> constant rotary movement 974, so <B> to </B> bring back the rod <B> 916 to </B> its normal position.

   For this position of the rod, a circuit is closed <B> to </B> across the earth, <B> the </B> battery, the electromagnet motor of the combiner <B> 900, </B> the driver <B> 920, </B> the lower right serial contact <B> 907, </B> the normal driver segment <B> 975, </B> the broom <B> 919, </B> the lower left serial contact <B> 953, </B> and the earth. The combiner <B> 900 </B> leaves his sixteenth position and returns <B> to </B> its normal position.



  As soon as the combiner <B> 900 </B> leaves its sixteenth position the circuit of the electric motor <B> 972 </B> is open at the lower serial contact of, right <B> 953. </B>



   <I> .Connection completion <B> to </B> a free line. </I> For position thirteen of the combiner <B> 10, </B> a circuit is closed <B> to </B> through earth, battery, right winding of relay <B> 151, </B> the lower right and upper left serial contacts <B> 152, </B> the conductor 154, the terminal <B> 128, </B> the broom 125, the serial contact <B> 130, </B> the driver <B> 103, </B> the terminal 49, the brush 46, the upper serial contacts 54, the internal left-hand neutral contact <B> of </B> relay <B> 15, </B> the upper right winding of the translator 55, and the earth.

   Relay <B> 161 </B> is excited and closes the circuit of the combiner motor electi-o-magnet <B> 150 </B> which passes from its fourteenth <B> to </B> his sixteenth position.



  By its left armature, the relay <B> 151 </B> close its blocking circuit passing through the earth, the battery, the left winding of the relay <B> 151, </B> the lower serial contact <B> 158, </B> the left armature and the contact of the relay <B> 151, </B> the serial contact.

   upper left <B> 159, </B> resistor 149, conductor 148, terminal <B> 126, </B> the broom "123, the mature rear right and the contact <B>. </B> rest- of relay 121, the upper left serial contact 120 and earth. <B> - </B> If the broom <B> 187 </B> of the arrival selector is in contact with the conductive segment of the switch <B> 188, </B> a circuit is completed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 150, </B> the upper left serial contact <B> 189, </B> the driver segment <B> 188, </B> the broom <B> 187, </B> the lower serial contacts <B> 169, </B> and the earth.

   The combiner <B> 150 </B> then goes from his sixteenth <B> to </B> his seventeenth position.



  When the combiner <B> 150 </B> reaches its fifteenth position, the next circuit is closed <B>: </B> earth, battery, re lais 202 windings, lower left serial contact <B> 203, </B> the conductor 204, the terminal <B> 181, </B> the ba lai <B> 182, </B> the driver <B> 183, </B> contact <B> 190, </B> <B> the </B> serial contact] higher <B> 191, </B> the conductor 154, the circuit originally described, the upper right-hand winding of the translator 55, and the earth.

   The relay 202 is energized and closes a circuit passing through the earth, the battery, the motor electromagnet of the combiner 200, the serial contacts of <B> - </B> right <B> 207, </B> the left armor and contact <B> of </B> work <B> of </B> relay 202, and the earth. The combiner 200 goes from its seventh. <B> to </B> his eighth position.

        If the called line is free, the full potential of the battery is applied <B> to </B> the test terminal <B> 231 </B> and when the 200 oc combiner takes its eighth position, a circuit is closed <B> to </B> through the earth, the battery, the winding of the cut-off relay 249 of the called line, the test terminal <B> 231, </B> the broom <B> 228, </B> the serial contact 235, the left winding <B> to </B> low resistance of the relay <B> 236, </B> lower serial contacts <B> 237, </B> the right winding <B> to </B> high resistance of the relay <B> 236, </B> and the earth.

   Relay <B> 236 </B> is excited and closes its blocking circuit including its rolling left <B> to </B> low resistance, its left armature and its contact <B> of </B> work, the left-hand ai-mature and the rest contact of the relay <B> 238, </B> and the earth. As a result of the low resistance of this circuit, the potential of the test terminal <B> 231 </B> is collapsed so that it places itself in an occupied condition.



  Relay <B> 236 </B> by its right armature closes a circuit passing through the earth, the battery, the combiner electromagnet 200, the lower left serial contact 210, the right armatures and the working contacts of the relay <B> 236 </B> and relay rest <B> 238, </B> and the earth. The combiner 200 switches from its. eighth <B> to </B> his fourteenth position. <B> A </B> this moment, the motor electromagnet is still ex cited <B> to </B> through the above circuit, and the combiner continues to move to its sixteenth position.

   For position seventeen of the combiner <B> 150, </B> a circuit is closed <B> to </B> tra towards the earth., The battery, the resistance <B> 192, </B> the right-hand ai-mature and the rest contact of the relay <B> 193, </B> the left serial contact 194, the relay winding <B> 195, </B> the left rest contact of the relay <B> 196, </B> the lower serial contact <B> 191, on </B> circuit originally traced, the translator <B> 55, </B> and the earth.

   Relay <B> 195 </B> is energized and closes a inrush circuit from the source of the inrush current <B> 197, </B> the right serial contact <B> 198, </B> the left winding of the relay <B> 193, </B> the right sezial contact <B> 199, </B> the lower armature and the working contact of the relay <B> 195, </B> the coupler 184, 'the broom <B> 185, </B> the terminal <B> 186, </B> the driver <B> 216, </B> lower serial contacts <B> 217, </B> the broom <B> 229, </B> the terminal <B> 232, </B> the circuit of station 201, the terminal <B> 233, </B> the broom <B> 230, </B> <B> the </B> higher serial contact <B> 203, </B> the conductor 204, the terminal <B> 181,

   </B> the broom <B> 182, </B> the driver <B> 183, </B> Superior farmature and the working contact of the relay <B> 195, </B> and the earth. The calling current is sent on the calling line, but due to the high resistance of the ringing placed <B> to </B> station 201 le re lais marginal <B> 193 </B> is not excited. However, as soon as the called subscriber removes his receiver, the current flowing in this circuit is sufficient to actuate this marginal relay.



  Relay <B> 193 </B> closes by its right armature a circuit passing through the earth, the battery # the resistance <B> 192, </B> the right winding of the relay <B> 193, </B> the left serial contact 194, the armature and the working contact of the relay <B> 193, </B> serial contact <B> 1501, </B> the left armor and the relay rest contact <B> 196, </B> the lower serial contact <B> 191, </B> the above circuit, the translator <B> 55, </B> and the earth.

   A shunt is thus formed around the coil of the relay <B> 195, </B> and this by its neutralization closes a circuit comprising: -the earth, the battery, the lower left winding of the translator 55, the winding of the supervision relay <B> 57, </B> the lower serial contacts 42, the brush 45, the terminal 48, the conductor <B> 131, </B> serial contact <B> 132, </B> the broom 124, the terminal <B> 127, </B> the driver <B> 155, </B> the lower sôrial contact <B> 156, </B> the winding of the supervision relay <B> 1511, </B> the lower armature and the rest contact of the relay <B> 195, </B> the driver 184, the broom <B> 185, </B> the terminal <B> 186,

   </B> the driver <B> 216, </B> lower serial contacts <B> 217, </B> the broom <B> 229, </B> the circuit of station 201, the terminal <B> 238, </B> the broom <B> 230, </B> the top serial contact <B> 203, </B> the conductor 204, the terminal <B> 181, </B> the broom <B> 182, </B> the driver <B> 183, </B> contact <B> 190, </B> the top serial contact <B> 191, </B> the conductor 154, the terminal <B> 128, </B> the broom <B> 125, </B> serial contact <B> 130, </B> the driver <B> 103, </B> the terminal 49, the brush 46, the upper serial contacts 54, the left inner rest contact of the relay <B> 16,

   </B> upper right rolling * of the translator <B> 55, </B> and the earth.



  Supervision relays <B> 57 </B> and <B> 1511 </B> are excited, and the last of these closes the next circuit; earth, battery, left winding of relay <B> 196, </B> the armature and the relay contact <B> 1511, </B> and the earth. Relay <B> 196 </B> completes the following blocking circuit for the marginal relay <B> 193: </B> earth, battery, resistance <B> 192, </B> the right winding of the relay <B> 193, </B> the right armature and the relay contact <B> 196, </B> the left arm ature and the working contact <B> of </B> this same relay, and the earth.



  The supervision relay <B> 57 </B> closes a fired circuit passing through the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> drive him <B> 58, </B> the lower left serial contact <B> 59, </B> the right outer frame and the rest contact <B> of </B> relay <B> 15, </B> the coriduc- tor <B> 17., </B> senior serial contacts <B> 60, </B> the armature and the working contact of the 57 # supervision relay and the earth.

   The combiner <B> 10 </B> from his thirteenth <B> to </B> his fourteenth position.



  A conversation circuit is now completed between the calling subscriber of the station <B> 1 </B> and the subscriber to station 201. <I> Restore selector switches. </I> If the subscribers want to interrupt the connection, they replace the receivers on the switch hooks. This <B> - </B> brings about the neutralization of supervision relays 20, <B> 57 </B> and 1511. The relay 20 closes a non-earth circuit, - the battery ,. the lamp <B> 19, </B> the armature and the rest contact of relay 20, the right winding <B> of </B> relay 21, the lower serial contact 22, and earth.

   Relay <B> 57 </B> closes the circuit passing through the earth, the battery, the lamp <B> 61, </B> resistance <B> 62, </B> the upper left serial contact <B> 63, </B> the armature and the rest contact of the relay <B> 57, </B> and the earth. The operator seeing the lam pes <B> 19 </B> and <B> 61 </B> lit ,. is informed that the conversation is over.

   She removes plug 4 from jack-5> amenanÏ la ne * utr'aliàa-tion-du re lais <B> 7. </B> The following circuit is then closed: the earth, the battery, the motor electromagnet <B> of </B> combiner <B> 10, </B> the driver <B> 58, </B> the lower left serial con tact <B> 59, </B> the right exterior armor and the rest contact of relay 15, the driver <B> 17, </B> the upper left serial con tact <B> 60, </B> the left armor and the relay rest contact <B> 7, </B> and the earth.

   The combiner <B> 10 </B> from his fourteenth <B> to </B> his eighteenth position.



  For this position a circuit is closed <B> to </B> through the earth, the battery, the windings of the motor electromagnet 74, the lower serial con tact <B> 73, </B> and the earth. The rod <B> 31 </B> the district selector returns to idle, and then the next circuit is closed <B>: </B> the earth, the battery, the electromagnet motor of the combination <B> 10, </B> the driver <B> 58, </B> the lower serial contact <B> of </B> right <B> 59, </B> the normal conductor segment 64, the brush 50, the upper right side contact <B> 18, </B> and the earth.

   The combiner <B> 10 </B> leaves his eighteenth position and returns <B> to </B> its normal position. The vertical motor electromagnet circuit is or green as soon as the combiner <B> 10 </B> leaves its eighteenth position.



  When the coinbineur <B> 10 </B> leaves its W / 4 position, the blocking circuit of relay 104 is open at the upper left serial contact <B> 18. This </B> relals, being neutralized, closes a circuit passing through the earth, the battery, the motor electromagnet <U> of </U> combiner <B> 100, </B> the upper left serial contact <B> 108, </B> the right frame # and the contact <B> of </B> rest of relay 104, and earth. The combiner <B> 100 </B> from his sixteenth <B> to </B> his eighteenth position.

   A circuit is then closed <B> to </B> through the earth, the battery, the winding of the motor electromagnet <B> 138, </B> the lower right serial contact 120, and the earth. The rod 112 returns to its normal position, and immediately the following circuit is completed: the earth, the battery, the motor electromagnet of the combiner <B> 100, </B> the serial contact 136, the normal conductive segment <B> 437, </B> lebalai <B> 116, </B> and the earth.

   The combiner <B> 100 </B> leaves his eighteenth position and returns <B> to </B> its .normal position. -The electro-airi) t -motor circuit <B> 135 </B> is open to the lower right serial contact 120 - as soon as the combiner <B> -100 </B> leaves its eighteenth position.



   <B> - </B> When the combiner <B> 100 </B> leaves its sixteenth position, the relay blocking circuit <B> -151 </B> is open to senior serial contact of <B> - </B> left 120. This relay being neutralized-closes <B> to </B> its right armature the above circuit traced for the motor electromagnet of the hoeing machine <B> 150, </B> and this one goes from its seventeenth <B> to </B> his eighteenth position.

   A circuit is then closed <B> to </B> through the earth., The bat <U> laughs, </U> the winding of the motor electromagnet 147, the serial cbntact 146, the conductor <B> 161, </B> the right armature and the rest contact <B> of </B> relay <B> 151, </B> and the earth. The arrival selector is then brought back to rest and for this position a circuit is closed. <B> to </B> through <B> the </B> earth, the battery, <B> the '' </B> motor electromagnet <B> of </B> i5O combiner, the lower right serial contact <B> 189, </B> the normal driver segment 145, the brush <B> 179, </B> the lower serial contacts <B> 169,, </B> and the earth.

   The combiner <B> 1 50 </B> leaves his eighteenth position and returns <B> -to </B> its normal position. The circuit of the electromagnet 147 is open to -serial contact 146 -as soon as the combiner <B> 150 </B> leaves its eighteenth position.



  When the combiner <B> 150 </B> leaves its position 171/4, the relay blocking circuit <B> 206 </B> is open to upper right serial contact <B> 169. </B> This relay <B> - </B> by its neutralization closes the following circuit <B> - </B> the earth, <B> -la </B> battery, the motor electromagnet <B> of </B> combiner -200, the upper serial contact on the left 210, Parmature on the left and the rest contact of the relay <B> 206, </B> and-the earth.

   The combi- nier 200 passes from its sixteenth <B> to </B> his eighteenth position. For this last position, a circuit is closed <B> to </B> through the earth, the battery, the winding of the electromagnet-motor 240, the serial contact 241, and the earth.

    The rod <B> 215 </B> comes back <B> to </B> the normal position, <B> - </B> and <B> to- </B> this moment, a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner 200, the lower right-hand serial contact 210, - the conductor 242, the conductive segment 243, the brush 223, and the earth .

   The combiner 200 'leaves its eighteenth position and resumes its re-position. pos. The motor electromagnet circuit -240 is opened at the lower serial contact 9-41 as soon as the combiner 200 leaves its eighteenth position.

       <I> Connection test of a line </I> occiil) ée. If the called line is busy, a reduced battery potential is applied to the test terminal and the marginal relay. <B> 236 </B> cannot be energized for the eighth position called combiner _200, however the -202 relay is energized for this position on the following circuit: earth, <B> the </B> battery, the windings of the relay 202 in series, the left serial contacts 244, the conductor 245, the right armatures and the contacts <B> of </B> relay rest <B> 236 </B> and <B> 238, </B> and the earth.

   A circuit is then closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner 200, the serial contacts on the right <B> 207, </B> the left armature and the working contact of relay 202, and the earth. The combiner 200 then switches from its eighth <B> to </B> his fourteenth position.

   As the relay <B> 236 </B> is at rest, the combiner 200 remains in its fourteenth position, and a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet 240, the upper serial contact 241, the right armatures and the rest contacts of the relays <B> 236 </B> and <B> 238 </B> and the earth. The brush holder rod <B> 215 </B> the final selector returns to idle and therefore closes a circuit <B> to </B> through the earth, the battery, the motor electromagnet of the combiner 2,) 0, the lower right serial contact 210, the conductor 242, the normal conductor segment 243, the arm 223, and the earth.

   The combiner 200 changes from its fourteenth iome <B> to </B> his seventeenth position. The device 247 producing the occupancy signal is now connected to the conductor <B> 216 to </B> through higher serial contacts <B> 237. </B> As soon as the calling subscriber places his receiver back on his switch, after having received the busy signal, the operator is informed in the usual way,

    and the switches return to their idle position as described above. Relay <B> 238 ' </B> is planned so <B> to </B> allow the choice of a called line independently of the busy or non-busy condition of this line. <I> Connection with a manual central office. </I> Now consider the case of a subscriber calling from the station <B> 1, </B> wishing to speak with a subscriber belonging to a central office of the manual type and having the number B 3456.

   The calling subscriber by removing his receiver from the switch hook causes a lamp to come on <B> 3, </B> and the attendant then inserts card 4 in the <B> jack 5. </B> A set of free registrars - and the key table are - then linked <B> to </B> the calling line of the <U> my </U> nière described. <B> A </B> At this moment, the positions occupied by the various combiners are as follows:

   the combiner <B> 10 </B> is in its second position, the combiner 425 is in its fifth position, the combiner 450 is in its seventeenth position, the combiner <B> 900 </B> is in its seventh position, and all the other combiners occupy their first position. Man work <I> of the key table. </I> The operator knowing the requested number, forms this number on her key table.

   She lowers the <B> key </B> of offices B, the <B> -key </B> of the thousand No <B> 3, </B> the <B> key </B> hundreds No 4, the <B> key </B> tens No <B> 5, </B> the <B> key </B> units -No <B> 6 </B> and the <B> key </B> starting <B> 667. </B> Lowering the <B> key </B> B causes the closure, contacts <B> 689, 690, 693 </B> and 694. Contact <B> 689 </B> complete the circuit passing through the earth, the battery, - the left winding of the relay <B> 609, </B> the driver <B> 696, </B> the <B> ' </B> contact <B> 689, </B> conductor 6à, the right winding of the relay <B> 61-2, </B> and the earth.

   The relays <B> 609 </B> and <B> 612 </B> are excited <B> - </B> and the first <B> of </B> these, <B> f </B> a- circuit passing through the earth, the battery, the motor-electromagnet of the combiner <B> -600, </B> the contact - general - upper - left <B> '613, </B> the conductor 614, the outer right armature and the relay contact <B> 609, </B> the driver <B> 615, </B> the right frame and the contact <B> of </B> relay work <B> 602, </B> and the earth., The combiner <B> 600 </B> from its first <B> to </B> its second position.



   <B> - </B> Contact <B> 690 </B> of the <B> key </B> B completes a circuit passing through the earth, the battery, the right bearing of the relay <B> 691, </B> contact <B> 690, </B> conductor 692, and earth, causing the relay to be energized <B> 691. </B> Contact <B> 693 </B> complete the circuit passing through the earth, the battery, the contact <B> 693, - </B> the winding of, right of the rela <B> - </B> is <B> 6 26 </B> and the earth, causing excitement <B> of </B> relay <B> 626. </B> Contact 694 - completes the cireuit - including land, <B> - </B> the battery, the relay winding <B> 695, </B> the contact 694, and the earth,

   causing the relay to be energized <B> 695. </B> <I> Recorder operation </I> dà <I> classes. </I> For the position <B> 1 </B> '/ 4 <B> of ' </B> combiner <B> 600, </B> the following circuit. is closed <B>:

   - </B> earth, battery, low resistance <B> 632, </B> the conductor 633, the armature and the contact <B> of </B> relay <B>, 612, </B> driver 634, conta: lower serial side, left <B> 635, </B> the driver <B> 636, </B> the left outer frame and contact <B> -of </B> relay <B> 937, </B> the conductor 940, - the- brush .941, the terminal 942, the:

  conductors 943 and <B> 601, - </B> the top serial contact of <B> - </B> left <B> 502, </B> the driver <B> 503, </B> the right windings of the marginal relays <B> 801, </B> and sensitive <B> -802, </B> and the earth. <B> - </B> Relays <B> 801 </B> and <B> 802 </B> are _excited given the low resistance of this circuit, and by attracting their left armatures they close the blocking circuits passing through the -terre, the battery, the -windings and the left armatures of the two relays in parallel , the drivers <B> 816 </B> and <B> 526, </B> W con tact, serial- inferior of ga.liche <B> 527, </B> and read land.



  For this same Position <B> 1 </B> 3/4 <B> of </B> COMBINATOR <B> 600, </B> a second- circuit is closed <B> to </B> through the earth., The contact <B> - </B> upper right serial <B> 638, </B> the driver <B> 639, </B> high resistance <B> 658, </B> the -right middle armature and the rest contact <B> of </B> 'relay <B> 608, </B> driver 641, <B> the </B> upper right serial contact 640, conductor 947, inner left armature and relay contact <B> 937, </B> the conductor 946, the brush 945, the terminal 044, the conductor <B> 608, </B> the lower right serial contact <B> 507, </B> the driver <B> 806,

   </B> the right windings of the marginal relays <B> 805 </B> and sensitive 804, the battery, and the earth. In consideration of the high resistance <B> 658 </B> included in the circuit, only the sensitive relay 804 is energized, and closes by its left armature its blocking circuit passing through its left winding, the driver <B> 816, </B> and the earth.



  When the combiner <B> 600 </B> reaches its second position, the following circuit is based on <B>: </B> the earth, the right armature and the rest contact <B> of </B> relay 643, the windings <B> to </B> bass and <B> to </B> high resistance relay 644 in series, lower serial contact 646, conductor 647, left middle armature and relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> the drivers <B> 951 </B> and <B> 808, </B> the right winding of the marginal relay <B> 809, </B> the driver <B> 810, </B> the upper left serial contact <B> 509, </B> the running of the relay <B> 510, </B> the battery, and the earth.

   The relays <B> 510 </B> and 644 are excited, but the presence in the circuit of Penrolling <B> to </B> Relay 644 high resistance fishing the marginal relay <B> 809 </B> to be. <B> - </B> Relay 644 closes by its left armature its blocking circuit, and causes relay 643 to be energized in the same way <B> de- </B> previously written.

   The. relay <B> 510 </B> either armature closes a circuit passing through the earth, the battery, the relay winding <B> 511, </B> the left serial contacts 512, the driver <B> 513, </B> the frame and the working contact <B> of </B> relay <B> 510, </B> the conductor 514, the ai-mature and the rest contact of the relay <B> 515, </B> serial contacts <B> 516, </B> the frame and the contact; relay rest <B> 517, </B> the driver <B> 518, </B> serial contact <B> 519, </B> and the earth.

   Relay <B> 511 </B> by attracting its left armature completes its blocking circuit passing through the upper serial contact <B> 953. </B> It also closes the circuit comprising the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the lower left serial contact <B> 521, </B> the right armature and the working contact of the relay <B> 511, </B> and the earth.

   The combiner <B> 500 </B> from its first <B> to </B> his second position then immediately <B> to </B> his third position thanks to <B> to </B> the closure <B> of </B> following circuit: earth, battery, combiner motor electromagnet <B> 500, </B> the driver <B> 522, </B> the armature and the rest contact of the relay <B> 523, </B> the upper left and lower right serial contacts 524, the armature and the working contact of the relay <B> 510, </B> the conductor 514, the armature and the rest contact of the relay <B> 515, </B> serial contacts on the periphery <B> 616, </B> the armature and the relay reset contact <B> 517, </B> the driver <B> 518,

   </B> the serial con tact <B> 519, </B> and the earth.



  As soon as the combiner <B> 600 </B> leaves its tenth position, the relay circuit <B> 510 </B> and 644 is open at the upper left serial contact <B> 509. </B> Neutralization of relay 044 causes the combiner to move <B> 600, </B> which passes from its second <B> to </B> his third position, as well as <B> already </B> been explained, and relay 643 is disabled.



  For the 23/4 position of the combiner <B> 500, </B> circuits are completed, which bring the combiner <B> 800 </B> of the class recorder in the desired position and determined by the relays of this recorder. In the planned installation, position eleven is the one assigned <B> to </B> the class of the considered call.

   Assuming therefore that the combiner <B> 800 </B> has remained in its twelfth position during the previous call, a circuit is completed <B> to </B> tra to the earth, <B> the </B> battery, the meter electromagnet of the combiner <B> 800, </B> the lower left serial contact <B> 815, </B> the right frame and the contact <B> of </B> relay 804 work, the driver <B> 812, </B> the serial contact] left 525, and the earth. The combiner <B> 800 </B> leaves its twelfth position and moves to its thirteenth position.

   The following circuit is then completed: the earth, the battery, the motor electromagnet of the combiner <B> 800, </B> the top serial contact <B> of </B> right 814, the right armature and the contact of the relay <B> 801, the </B> driver <B> 812, </B> and the earth. The combiner <B> 800 </B> pass from to thirteenth <B> to </B> its first position.

   For the latter, a circuit wedging the motor electromagnet of the combiner <B> 806 </B> is completed <B> to </B> through Parmatu re on the right and the rest contact of the relay <B> 809. </B> The combiner <B> 800 </B> thus passes from its first <B> to </B> its tenth position, and a home run is <U> created </U> <B> to </B> through the right armature and the normally closed contact of the relay <B> 805 </B> to bring this combiner <B> 800 </B> in its eleventh position. <B> A </B> At this time all branches of the combiner circuit are open.



       Man work <I> of </I> The recorder <I> brooms </I> <B> <i> - </I> </B> <I> of districts. </I>



  For the 23/4 position of the combiner <B> 600 </B> and-position 21/4 of the combiner <B> 500, </B> a circuit is closed <B> to </B> through the earth, the bat terie the low resistance <B> 632, </B> the driver <B> 633, </B> the armature and the relay contact <B> 691, </B> the driver <B> 666, </B> the lower right serial contact <B> 651, </B> the conductor 647, the left middle armature and the relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> drivers <B> 951 </B> and <B> 528, </B> the lower right serial contact <B> 529, </B> the driver <B> 530, </B> the right-hand windings of the sensitive relays <B> 531 </B> and marginal <B> 532, </B> and the earth.

   As a result of the low resistance 432, the relays <B> 531 </B> and <B> 532 </B> are excited and close <B> to </B> their- left armatures of the blocking circuits including the Conductor <B> 816. </B> For the third 'position of the combiner <B> 600, </B> a circuit is closed <B> to </B> through the cylinder, the left armor and the rest contact of the relays <B> 652, </B> the windings <B> to </B> bass and <B> to </B> high resistance of relay 649 in series, the lower serial contact <B> 680, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 987, </B> conductor 940, brush 941, terminal 942, conductor 943, right winding of marginal relay 533, conductor 534,

   the left serial contact <B> 535, </B> the relay winding <B> 523, </B> the battery, and the earth. The relays <B> 523 </B> and 649 are excited, but like, winding <B> -to </B> high resistance of relay 649 # is included in the circuit, marginal relay 533 remains neutralized.



  The right armature of relay 649 closes a blocking circuit for it and causes <B>. </B> tie neutralization of the relay <B> 652 </B> in the way <B> already </B> described. The left armature Ae of this same relay closes a circuit passing through the earth, the upper serial contact <B> 656, </B> low resistance <B> 657, </B> the left frame and <B> the </B> contact of relay 649, the driver <B> 639, </B> the high resistance .658, the splitter 65811, the lower right serial contact 640, the conductor 947,

   the inner left armature and the relay contact <B> 937, </B> conductor 946, brush 945, terminal 944, conductors 508 and 536, - the upper serial contact <B> 537, </B> the relay winding <B> 51.5, </B> the battery, and the earth.

   Relay <B> 515 </B> is excited and closes a circuit comprising the earth, the battery, the electromagnet motor of the combiner <B> 500, </B> the driver <B> 522, </B> the armature and the working coi itact of the relay <B> 523, </B> the lower left and upper right serial contacts 524, ' <B> the </B> conductor 514, armature and contact <B> of </B> relay work <B> 515, </B> the lower left and upper right serial contacts <B> 516, </B> the armature and the rest contact of the relay <B> 517, </B> the cohêlucteur <B> 518, </B> the serial contact <B> 519, </B> and the earth.

   The combiner <B> 500 </B> from his third <B> to </B> its fourth position. The circuits of relays 515, <B> 523 </B> and 649 are open, and the last of these -Pr <B> - </B> 0- evokes the movement of the combiner <B> 600 </B> of his third <B> to </B> his fourth position. Relay <B> 652 </B> is then neutralized.

           Hanceuvre <I> of the group recorder </I> <I> of districts. </I> For positions four of the combiners <B> 600 </B> and <B> 500, </B> the following circuit is closed: the earth, the right armature and the working contact of relay 643, the windings <B> to </B> bass and <B> to </B> high resistance <B> of </B> relay 644 in series, the lower serial contact 646, the conductor 647, the middle armature on the left and the, contact- <B> of </B> relay <B> 937, </B> -the <B>. </B> -conductor 948, broom 949, terminal <B> 950, </B> the driver <B> 951, </B> the right winding of the marginal relay 542, the conductor 543, the upper serial contact <B> 509,

   </B> the relay winding <B> 510, </B> the battery, and the earth. The relays <B> 510 </B> and 644 are excited, but the marginal relay <U> 542 </U> remains neutralized <B> to </B> because of the high resistance of the circuit. Relay 644 closes a blocking circuit via its left armature and causes relay 643 to be energized.

     <B> He </B> closes the following circuit with its right armature: earth, resistance 63811, the left serial contact <B> 638, </B> the right armature and the contact of relay 644, the coupling <B> 639, </B> high resistance <B> 658, </B> the driver 658a, the lower right serial contact 640, the conductor 947, the inner left armature and the relay contact <B> 937, </B> conductor 946, brush 945, terminal 944, conductor <B> 508, </B> the right winding of marginal relay 544,

   conductor 545, upper serial contact 546, relay winding <B> 517, </B> the <B> - </B> battery, and the earth. The marginal relay is not energized, but the relay <B> 517 </B> closes the circuit comprising the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the conductor 522, the armature and the rest contact of the relay <B> 523, </B> the upper left and lower right serial contacts 524, the armature and the working contact of the relay <B> 510, </B> the conductor 514, the armature and the rest contacts of the relay <B> 515, </B> serial contacts. superior <B> of </B> left and lower right <B> 516, </B> the armature and the working contact of the relay <B> 517, </B> the driver <B> 518,

   </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> pass from his fourth <B> to </B> his fifth position. The circuits of the relays <B> 517, 510 </B> and 644 are open, and the last of these causes the combiner to move <B> 600 </B> of his fourth <B> to </B> his fifth position. Relay 643 is then neutralized.



       Man work <I> of the brush recorder </I> <I> of offices. </I>



  For the 43/4 positions of the combiners <B> 000 </B> and 50é, the following circuit is closed <B>:. </B> earth, battery, high resistance <B> 699, </B> the armature and the relay contact <B> 626, </B> the driver <B> 662, </B> the upper left serial contact <B> 651, </B> driver 647, <B> the * </B> left middle armor and contact of the re lais <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> drivers <B> 951 </B> and <B> 628, </B> the upper right serial contact <B> 529, </B> the conductor 548, the right windings of the sensitive relays 549 and marginal 650, # and the earth.

   The marginal relay remains neutralized, but the sensitive relay is energized and closes its blocking circuit. Relay 549 also closes a circuit passing through the earth, the battery, the relay winding. <B> 762 </B> (fig. <B> 15) </B> the armatures on the right and the rest contacts of the relays <B> 550 </B> and <B> 551, </B> the right armature and the working contact of relay 549, the driver <B> 761, </B> the right serial contact <B> 525, </B> and the earth.

   Relay <B> 762 </B> closes its blocking circuit passing through the earth, the battery, the winding of the relay <B> 762 </B> the left armor and the working contact <B> of </B> this relay, the driver <B> 763, </B> the upper serial contact <B> 527, </B> and the earth.



  For the fifth position of the combi- niers <B> 600 </B> and <B> 500, </B> the following circuit is carried out <B>: </B> the earth, the left armature and the rest contact of the relay <B> 652, </B> the windings <B> to </B> high and <B> to </B> low resistances 649 in series, the lower serial contact <B> 680, </B> the driver <B> 636, </B> the outer left armature and the relay contact <B> 937, </B> conductor 940, 'brush 941, terminal 942, conductor 943, right winding of marginal relay <B> 551, </B> the driver <B> 552, </B> the right serial contact <B> 535, </B> the winding of the relay <B> 523, </B> the battery, and the earth.

   The relays <B> 523 </B> and 649 are excited, but the marginal delay remains neutralized. Relay 649 closes by its right armature a blocking circuit and causes the excitation <B> of </B> relay <B> 652. </B> Through his left-hand ai-mature, he completes the circuit passing through the earth, the serial contact <B> 656, </B> resistance <B> 657, </B> the right armor and the contact of relay 649, the driver <B> 639, </B> high resistance <B> 658, </B> the 65811 driver, the lower right serial contact 640, the 947 driver, the left inner frame and the contact <B> says </B> relay <B> 937, </B> conductor 946, broom 945, terminal 944,

   the drivers <B> 508 </B> and <B> 536, </B> the top serial contact <B> 537, </B> Relay winding <B> 515, </B> the battery, and the earth. Relay <B> 515 </B> being energized closes a circuit comprising the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the driver <B> 522, </B> Farmature and the relay working contact <B> 523, </B> the lower left and upper right serial contacts 524, the armature and the rest contact of the relay <B> 510, </B> the conductor 514, the armature and the working contact of the relay <B> 515, </B> the lower left and upper right serial contacts <B> 616,

   </B> the armature and the rest contact of the relay <B> 517, </B> the driver <B> 518, </B> the -serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> from his fifth <B> to </B> his sixth position. <B> <i> 3 </I> </B> Relays 516, <B> 523 </B> and 649 are lieutrailized, and the last of these causes the combiner to move <B> 600 </B> of its fifth # <B> to </B> his sixth position. Relay <B> 652 </B> is then neutralized ..

           Maneuver <I> of the group recorder </I> <I> of </I> bue-eaux. For the six positions of the combiners <B> 600 </B> and <B> 500, </B> the following circuit is closed <B>: </B> the earth, the frame <B> of </B> right and the rest contact of relay 643, the left winding <B> to </B> low resistance of relay 644, the driver <B> 660, </B> the armature and the relay contact <B> 695, </B> driver 645, the upper right serial contact <B> 651, </B> the conductor 647, the left middle armature and the relay contact <B> 937, </B> the conductor 948, the brush 949, the terminal <B> 950, </B> the driver <B> 951, </B> the right winding of the marginal relay 547, the conductor 548,

   the lower serial contact 509, the relay winding <B> 510, </B> the battery, and the earth. The relays <B> 510 </B> and 644 are energized as well as marginal relay 547, which closes <B> to </B> its left frame a blocking cil-cuit passing through its left winding, the conductor <B> 816, </B> and the earth. Relay 644 closes a blocking circuit by its left armature and causes relay 643 to be energized in the same way <B> de- </B> <B> already </B> described.

   The right armature of relay 644 completes a circuit passing through earth, resistor 68811, the left serial contact <B> 638, </B> the right armature and M'contact relay 644, the driver <B> 639, </B> high resistance <B> 658, </B> the 65811 conductor, the lower right serial con tact 640, the 947 conductor, the left inner armature and the relay contact <B> 957, </B> the conductor 946) the broom 945, the terminal 944, the conductor <B> 508, </B> the top serial contact <B> 507, the </B> driver <B> 556, </B> the right winding of the marginal relay <B> 557, </B> driver 568,

      the relay rolling <B> 517, </B> the -battery and the earth. The marginal relay is not energized, but the relay <B> 517 </B> attracts its armature and closes the circuit comprising the earth, the battery, the electromagnet motor of the combiner <B> 500 ' </B> the conductor 522, the frame and <B> - </B> the rest contact of the relay <B> 523, </B> the upper left and lower right serial contacts 524, the armature and the working contact of the relay <B> 510, </B> the driver 514, the mature ar and the rest contact of the relay <B> 515, </B> the upper left and lower right serial contacts <B> 516, </B> the frame and <B> the </B> relay working contact <B> -517, </B> the driver <B> 518,

   </B> serial contact <B> 519, </B> and the earth. The combiner <B> 500 </B> from his sixth <B> to </B> his seventh position.



  As soon as the combiner <B> 500 </B> leaves its 11th position, the relay circuits <B> 517, </B> <B> 510 </B> and 644 are open. The last of these by its reinforcement causes the movement of the combiner <B> 600 </B> of his sixth <B> to </B> its seventh position, and hence the excitation of relay 643. Since the number of the called line is the same as that assumed for the first call the remaining recorders are operated in the same way as described above. It is therefore unnecessary to describe it here.



  When the called number has been completely closed on the recorders, <B> the com.- </B> weeder <B> 500 </B> moves into its twelfth position. The combiner <B> 600 </B> is reinstated <B> to </B> its normal position in the <B> already </B> described.



   <I> Selection of district brooms. </I>



  For the seventh position of the combiner <B> 500, on </B> fundamental circuit is closed <B> to </B> tra to earth, battery, winding <B> of </B> left of the relay <B> 903, </B> later serial contacts <B> 909, </B> the driver 954, the broom <B> 955, </B> the terminal <B> 956, </B> the driver <B> 957, </B> the serial contact <B> 590, on </B> driver <B> 819, </B> the lower serial contact 764, the driver <B> 765, </B> the lower serial contact <B> 766, </B> drivers <B> 767 </B> and <B> 821, </B> The left frame and the counter relay rest contact <B> 0 ',

   </B> Winding the relay not <B> to </B> not <B> 701, </B> the top serial contact <B> 702, </B> resistance <B> 703, </B> and the earth. The relays <B> 701 </B> and <B> 903 </B> are excited, and <B> the </B> first of these closes the circuit of the counter 4 relay, which <B> to </B> his turn prepares the circuit of relay 41. The relay <B> 903 </B> complete its blocking circuit including the earth, the battery, the left coil of the relay <B> 903, </B> the lower left serial contact <B> 909, </B> the right armature and the working contact of the relay <B> 903, </B> the lower serial contact <B> 910, </B> the fundamental circuit, and the earth.

   By his left-wing ai, the relay <B> 903 </B> complete the circuit including the earth, the battery, the motor electromagnet of the combination <B> 900, </B> the lower left serial contact <B> 907, </B> the left armature and the relay working contact <B> 903, </B> and the earth. The combiner <B> 900 </B> from his seventh <B> to </B> his eighth position.



  For this last position, the following circuit is closed <B>: </B> the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the lower left serial contact <B> 26, </B> the driver <B> 27, </B> the upper serial contact 420, the conductor 411, the outer right armature and the relay contact 924, the conductor <B> 959, </B> the lower left serial contact <B> 915, on </B> driver <B> 908, </B> the left armature and the contact of the relay <B> 903, </B> and the earth. The combiner <B> 10 </B> pass <B> of </B> his second <B> to </B> his fourth position.

   A circuit is then closed <B> to </B> through the earth, the battery, the winding of the vertical motor electromagnet <B> 28, </B> the lower serial contact <B> of </B> right 14, drivers <B> 13 </B> and <B> 27, </B> the circuit described above, the armature on the left and the working contact of the relay <B> 903, </B> and the earth. The rod <B> 31 </B> moves up and the relay <B> 701 </B> is bypassed by the switch <B> 33 </B> and the broom <B> 39. </B> in the way <B> already </B> described. The operation of the counters is thus obtained.

   For the fifth relay excitation <B> 701, </B> a circuit is completed <B> to </B> tra to earth, battery, winding <B> of </B> counter relay <B> 6, </B> the upper right serial contact <B> 712, </B> the driver <B> 711, </B> the top serial contact <B> 710, </B> the driver 824, the serial contact <B> 823, </B> the driver <B> 822, </B> the mature ones <B> of </B> right and the working contacts of the relay <B> 531 </B> and relay rest <B> 533, </B> the outer frame <B> of </B> right and the working contact <B> of </B> relay <B> 532, </B> conductor 749, (fig. <B> 15 </B> and <B> 13), </B> the lower serial contact <B> 750,

   </B> the armatures and working contacts of the counter relays <B> He at </B> 4 'series cry, mature arrays and rest contacts of relay 70-1 and working of relay <B> 701, </B> and the earth. The counter relay <B> 0 </B> is energized and prepares a circuit for the counter relay <B> 0 '. </B> When the broom <B> 32 </B> rubs the relay on a conductor segment <B> 701 </B> is neutralized and the counter relay <B> 01 </B> is excited.

   By attracting its right arm, this last relay closes the following circuit <B>: </B> the earth, the battery, the electromagnet motor of the combiiieur <B> 700, </B> the driver <B> 713, </B> the upper left serial contact <B> 717, </B> the driver <B> 768, </B> the lower right serial contact <B> 884, </B> the driver <B> 715, </B> the right frame and <B> the </B> counter relay contact <B> 0 ', the </B> right serial contact <B> 706, </B> the driver <B> 707, </B> the right-hand serial contacts <B> 513, </B> the mature <B> of </B> right and the working contact of the relay <B> 511,

   </B> and the earth. The coin-cultivator <B> 700 </B> from its first <B> to </B> its second position and then closes the circuit containing the earth, the battery, the motor electromagnet <B> of </B> combiner <B> 700, </B> the lower left serial contact <B> 717, </B> the right armature and the rest contact of the relay <B> 718, </B> the left armor and the relay rest contact <B> 719, </B> and the earth. The combiner <B> 700 </B> moves in its third position.



  The left armature of the relay <B> 01 </B> opens the fundamental circuit and causes the neutralization of the relay <B> 903, </B> as soon as the broom <B> 32 </B> passes on the isolated segment next to coin-mutator 83. The relay <B> 903 </B> by leaving its left armature opens the circuit of the electromagnet <B> 28, </B> and closes a circuit not healthy by the earth, the battery, the motor electromagnet of the combiner <B> 10, </B> the original serial contact <B> 36, </B> the driver <B> 37, </B> the upper serial contact 428, the driver <B> 935,

   </B> the inner left ar mature and the relay contact <B> 930, </B> the upper right-hand serial contact 934, the armature and the rest contact of the relay <B> 903, </B> and the earth. The combiner <B> 10 </B> pass from his fourth <B> to </B> its fifth position, For this one, a circuit is completed <B> to </B> -through the earth, the battery, the motor electromagnet of the combiner <B> 900, on </B> upper left serial contact <B> 921, </B> the left middle armature and the relay contact <B> 930, </B> the driver <B> 961, </B> the top serial contact 4.24, the driver 415.

   the lower left and upper right serial contacts 24, the left armature and the working contact of the relay <B> 7, </B> and the earth. The combiner <B> 900 </B> pass from his eighth <B> to </B> its ninth position.



  For position five of the combiner <B> 10, </B> a circuit is closed <B> to </B> through the earth, the battery, the winding of the electromagnet <B> 65, </B> the lower serial contact <B> 18, </B> and the earth. The excitation of the electromagnet <B> 65 </B> bring the rod <B> 66 </B> in the desired position to trigger the fifth set of brushes when the rod <B> 29 </B> moves up again. <B> - </B> <I> Selection of groups of districts. </I> For the ninth position of the combiner <B> 900 </B> and the third position of the combiner <B> '700, </B> the fundamental circuit is closed,

       denying the neutralization of the relays <B> 903 </B> and <B> 701. </B> As the marginal relay 544 is neutralized, the relay 704 is not energized, and it follows that the relay <B> 701 </B> closes counter relay circuit 4 instead <B> of </B> counter relay circuit <B> 9, </B> as in the first case considered.

   This relay 4 prepares a circuit for relay 41, and since none of the relays of the district group recorder are energized the relay <B> 701 </B> also closes a circuit passing through the earth, the battery, the winding of the counter relay <B> 0, </B> the upper right serial contact <B> 712, </B> the driver <B> M, </B> the lower serial contact <B> 720, </B> the driver <B> 721, </B> serial contact <B> 829, </B> the driver <B> 830, </B> the right armature and the rest contact of relay 640, the outer right armature and the rest contact of relay 542, the conductor <B> 737 </B> (fig. <B> 15 </B> and <B> 13),

   the </B> lower serial con tact <B> 755, </B> the armatures and the rest contacts of relay 704, and the working of the relay <B> 701, </B> and the earth. The counter relay <B> 0 </B> is excited and prepares the relay circuit <B> 0 '. </B>



  By its right armature, the relay <B> 903 </B> closes its blocking circuit, and by its mature ar <B> dice </B> left completes the circuit of the conibiner <B> 900 </B> which passes from its ninth #, th <B> to </B> his tenth position. For this last position, the combiner circuit <B> '10 </B> is closed at the lower left serial contact <B> 915, </B> and the left armature and the working contact of the relay <B> 903. </B> The combiner <B> 10 </B> from his fifth <B> to </B> his sixth position.

       Motor electromagnet <B> 2.8 </B> is then excited, causing the upward movement of the rod <B> 31. </B> During this movement, each time the broom <B> 39 </B> comes into contact with a conductive segment of the switch 40, the relay <B> 701 </B> is neutralized and the counter relays are actuated in the ordinary manner. As soon as the broom <B> 39 </B> goes to the first conductive segment and the relay <B> 701 </B> is neutralized, the counter relay <B> 01 </B> is excited and closes the combiner circuit <B> 700- </B> which passes from its third <B> to </B> its fifth position.

        For the 43/4 position of the combiner <B> 700 </B> the following circuit is closed. the battery, the windings of the meter relays <B> 0 </B> and <B> 01, </B> the upper right serial contact <B> 790, </B> the driver <B> 776, </B> the armature and contact of the relay <B> 762, </B> and the earth.

   The relays <B> 0 </B> and <B> 0 ' </B> are therefore kept excited on this circuit, while the combiner occupies its positions between positions 4'1 / 14 and seven. For position five, the electromagnet circuit. combiner motor <B> 700 </B> is still closed, and this one passes its fifth <B> -to </B> his seventh position. <B> -A </B> this moment, <B> the </B> The following circuit has been completed: the;

   earth, the battery, the motor electromagnet of the 500 combiiier, the upper right serial contact <B> 591, </B> the. driver <B> 729, </B> the right-hand serial <B> 850, </B> driver 731, <U> the </U> top serial contact <B> 732, </B> and the earth.

   The combiner-600 goes from. his twelfth <B> to </B> its thirteenth position and closes the circuit for the combiner electromagnet <B> 700 to </B> through the circuit above, the driver <B> 769, </B> the lower serial contact <B> of </B> left <B> 770, </B> the driver <B> 771 ,, </B> lower serial con tacts <B> 882, </B> the driver <B> 781, </B> the cont <B> ' </B> lower left act <B> 592, </B> and Ja terre. The combiner <B> 700 </B> going from his seventh <B> to </B> his eighth position.

   For this, the following circuit is closed <B>: </B> the earth, the battery, the electromagnet motor of the combiner <B> .700, </B> the driver <B> 713, </B> the lower sei-ial- contact <B> 717, </B> the armature and the relay reset contact <B> 719, </B> and the earth. The combiner <B> 700 </B> pass from his eighth <B> to </B> its ninth position.

      For this last position, a circuit is closed <B> to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 700, </B> the lower right serial contact <B> 773, </B> the driver <B> 774, </B> the top serial contact <B> 875, </B> and the earth, bringing the combiner <B> 700 </B> of his ninth <B> to </B> its first position.

      When the relay <B> 0 ' </B> is excited for the third position <B> of </B> combiner <B> 700, </B> the fundamental circuit is open, which leads to the neutralization of the relay <B> 903 </B> as soon as the broom <B> 39 </B> rubs on the neighboring isolated segment. This relay <B> 903 </B> Owe the circuit <B> of </B> the electromagnet <B> 28, </B> and thus stops the fifth set of brushes in contact with the first group of terminals of the row considered.

    By its left armature, this same cable closes a circuit passing through the earth, the battery, the electromagnet motor of the -com- bineur <B> 10, </B> the upper left serial contact <B> 36, </B> driver 415, <B> the </B> higher serial contact 424, the driver <B> 961, </B> the left middle mature ar and the relay contact <B> 930, </B> the lower serial contact <B> 921, </B> the left armature and the contact, rest of the relay <B> 903, </B> and the earth. The combiner <B> 10 </B> from his sixth <B> to </B> his seventh position.

         For this, the following circuit is closed - earth, battery, electromagnet * combiner motor <B> 900, </B> the driver <B> 920, </B> the lower right sùi-ial contact <B> 932, </B> the driver <B> 960, </B> the left external contact of the relay <B> 930, </B> driver 413, top serial contact 422, driver <B> 35, </B> the lower serial contact 34, and the earth. The combiner <B> 900 </B> goes from his tenth <B> to </B> its eleventh position.

   This one, the next circuit is closed <B>: </B> the earth, the battery, the left winding of the relay <B> 903, </B> the driver 904, the serial contact on the right <B> 939, </B> and the earth. Relay <B> 903 </B> by its excitation closes its blocking circuit passing through the earth, the battery, the right winding <B> of </B> relay <B> 903, </B> the.

   upper serial contact <B> 909, </B> the right-wing man and the <B> - </B> relay working contact <B> 903, </B> the upper left serial contact <B> 910, </B> the frame <B> of, </B> left and the relay contact <B> 930, </B> the driver <B> 935, </B> the superior serial contact 428, the driver <B> 37, </B> the lower left serial contact 25, and the earth. Relay <B> 903 </B> now <B> u </B> excited, close the combiner circuit <B> 900 </B> which passes from its eleventh <B> to </B> his twelfth position.



  A circuit is now closed <B> to </B> the mature rear on the left and in the working contact of the relay <B> 903 </B> by the combiner <B> 10, </B> which passes its seventh <B> to </B> his eighth position. The trunk line search is performed at the District Selector as described above.

   If the junction line first encountered by the balais 44, - 45 'and 46 is crossed, a land is found <B> to </B> through the lower right serial con tact <B> 251 </B> the driver <B> 76, </B> resistance <B> 52, </B> the test brush 44 and the terminal-47. As soon as the brushes 44, 45 and 46 find a free junction line, the relaig <B> 903 </B> is neutralized and opens the circuit of the electromagnet ' <B> 28. </B> On the other hand,

    this relay closes the combiner circuit <B> 10 </B> which moves from its eighth <B> to </B> his tenth position.



  T <B> ' </B> for this last position of the coinbi- neur <B> 10, </B> a circuit is closed <B> to </B> through earth, battery, resistor 53, upper serial contact <B> 2.5, </B> the driver <B> 37, </B> the upper serial contact 428, <B> the </B> driver <B> Ù5, </B> the left inner frame and contact <U> -du </U> relay <B> 930, on </B> upper left serial contact <B> 910, </B> the right armature and the relay rest contact <B> 903,

   </B> the upper right serial contact 964, the relay winding <B> 965, </B> and the earth. This relay <B> 965 </B> close <B> to </B> the following circuit in turn: the earth, the battery, the electromagnet motor 'of the combi- rier <B> 900, </B> the driver <B> 920, </B> the upper right serial contact 907 ,. the left exterior a # matu.and the working contact <B> of </B> relay <B> 965, </B> the driver <B> 963, </B> the clever armature and the rest contact of the relay <B> 937,

   </B> the upper left contact- <B> of </B> relhis <B> 939 </B> and the earth. The combiner <B> 900 </B> goes from twelfth to thirteenth position.



  For the tenth position #du <B> - </B> combiner the Operator's station is automatically disconnected <B> of </B> cord circuit, and the, relay <B> 15. </B> is neutralized. <B> A </B> circuilt is then <I> closed </I> take the thirteenth position <B> of </B> combi- iieur <B> 900, </B> and this circuit includes- the earth, the battery, the motor electromagnet of the -combineur 10,

  - the conductor- 58, - the lower left serial contact <B> '59, </B> the outer right armature and the rest contact of the relay <B> 15, </B> the driver <B> 17, on </B> ebiitact'sérial superior -de- left 14, the conductors <B> 18 </B> and <B> 27, </B> the upper serial contact 420, the driver 411, - the outer frame <B> of </B> right and the;

  relay contact 924, the driver the upper serial contact <B> 970, </B> the right interior armature and the relay contact <B> -965, </B> the driver 946, the broom 945, the drivers 944 and <B> 508, </B> the lower left serial contact <B> 507, </B> the driver <B> 833, </B> the lower right serial contact <B> 875 </B> and the earth. The combiner <B> 10 </B> pass from tenth <B> to </B> his eleventh position.

   The relay circuit <B> 965 </B> <U> is </U> open at the upper serial contact 25, and the neutralization of this relay causes the closing of the following circuit <B>: </B> the earth, the battery, the motor electromagnet of the combiner 900, - the conductor <B> 920, </B> the upper left rial contact <B> 907, </B> the outer left armature and the relay contact <B> 965 ,, </B> the driver <B> 963, </B> the frame. <B> of </B> right and the rest contact of relay 937-, the upper left contact of the relay <B> 939., </B> and-, the earth.

   Combixieur # 9QO Passes from his 4th <B> to </B> sa. qqato # zièn1st position.



       AP indicator operation <B> <I>. </I> </B> _pel & .relais.



  For position eleven of the combinetir 10,1a .position fourteen <B> " </B> ze. of combiner 900j e-position one of combiner 700, -u <B> ' </B> n circuit is closed <B> to </B> through the earth, the battery, the left winding dti ,. relay 25.1 (fig. <B> 5), </B> the right rest. Contact.

   relay <B> 272, </B> Lower left winding of trans- lator .253, the inner armature and the normally-open contact of relay 254, the, conductor <B> 255, </B> the terminal <B> 67, </B> the broom <B> - </B> 45, serial co, ntacts -lower right- -and.

   upper left 42, conductors ... 43 and <B> 37, </B> the upper serial contaet 4228, the driver <B> 935, </B> the inner left frame and -the contact of the re lais <B> 930, </B> the lower serial contact 934, the conductor <B> 968, </B> the broom <B> 967, </B> terminal 966;

   the driver 74 ##, the lower right serial contact <B> 851, </B> the driver 834, the serial contact <B> 777, </B>, the driver <B> 778, </B> serial contacts - right <B> 799, </B> the terminal <B> 837, </B> serial contacts: superior <B> 835, </B> the driver <B> 836, </B> the winding of the -relay- <B> 719, </B> and the earth.

   Relays 2 # 2 and <B> 719 </B> are excited, and the last <B> - from </B> _these close the circuit passing through the earth, the battery, the winding of. relay right <B> .218, </B> the frame and the contact- <B> of </B> relay work <B> 79, </B> and earth-.

   Relay <B> 718 </B> is activated and closes a circuit passing through the earth, the battery, the motor electromagnet of the combination <B> 700, </B> the lower left serial contact <B> 773, </B> the driver <B> 780, </B> The left frame and the working contact of the relay <B> 718, </B> the driver <B> 781, </B> lower serial contacts <B> 782, </B> the driver <B> 771, </B> the lower left serial contact <B> 732, </B> and the earth. The combiner <B> 700 </B> from its first <B> to </B> its second position.

   A circuit is then closed for the combiner <B> 500 to </B> through the earth, the battery, the motor electromagnet of the combiner <B> 500, </B> the upper left serial contact <B> 521, </B> the driver <B> 597, </B> the right serial contact <B> 770, </B> contact <B> 592, </B> and the earth .. The combiner <B> 500 </B> then goes from his thirteenth <B> to </B> his fourteenth position.



  Relay 251 closes the circuit following earth, battery, lamp <B> 256, </B> the right armature and the relay contact <B> 251, </B> the external left-hand ar- inature and the rest contact of the relay <B> 257, </B> resistance <B> 258, </B> and the earth. The lamp <B> 256 </B> lights up, and the operator of the called central office is thus informed that a call has been sent to the corresponding trunk <B> to </B> this lamp.

   She lowers the <B> key 259, </B> which forms the following circuit <B>: </B> earth, battery, relay winding <B> 301, </B> the right-hand serial contacts <B> 302, </B> the driver <B> 303, </B> the <B> key 259, </B> Winding relay 254, and earth. Relay <B> 301 </B> closes with its frame <B> of </B> its blocking circuit on the right, and by its left armature the following circuit <B>. </B> the earth, the battery, the winding of the electromagnet not <B> to </B> not the combiner <B> 300, </B> the armature and the normally closed contact of this electromagnet, the right-hand serial contacts 304, the left armature and the working contact of the relay <B> 301, </B> and the earth.

         The electromagnet <B> 300 </B> is excited, and by attracting its left armature interrupts the circuit, which causes its neutralization. The combiner <B> 300 </B> therefore occupies its second position.



  It should be observed that the excitation of relays 254 interrupts the internal and lower contacts of this relay the circuit for the relays. <B> 251 </B> and <B> 719. </B> relay you <B> MI </B> 'open the circuit of the lamp <B> 256, </B> which turns off.



  Relay <B> 719 </B> causes the relay to be neutralized <B> 718, </B> and then a circuit is closed <B> to </B> through the earth, the battery, the electromagnet motor of the combiner <B> 700, </B> the driver <B> 713, </B> the lower left serial contact <B> 717, </B> the inner right armature and the relay contact <B> 718, </B> the frame and <B> the </B> relay neutral contact <B> 719, </B> and the earth. The Combiner <B> 700 </B> pass <B> to </B> its second position.

    For positions two and 2 8/4 of the respective combiners <B> 300 </B> and <B> 700, </B> -a circuit is closed <B> to </B> through the earth, the battery, the bearings of the relays <B> 305 </B> and <B> 306, </B> the driver <B> 307, </B> contact <B> 308, </B> the driver <B> 309, </B> the upper inner frame and the working contact of relay 254, the driver <B> 261, </B> contact <B> 68, </B> the brush 46, the upper right and lower left serial contacts 54, the conductors <B> 38 </B> and 415, the upper serial contact 424, the driver <B> 961, </B> the left middle mature ar and the relay contact <B> 930,

   </B> the upper right serial contact <B> 921, </B> the driver 954, the broom <B> 955, </B> the terminal <B> 956, </B> the driver <B> 957, </B> the lower serial contact <B> 590, </B> the driver <B> 819, </B> the lower serial contact <B> 820, </B> the driver <B> 763, </B> the upper right serial contact 764, the driver <B> 783, </B> the left serial contacts 784, the driver <B> 785, </B> the upper right serial contact <B> 886, </B> the driver <B> 787, </B> the upper right serial contact <B> 788, </B> and the earth.

   In the rest of the description, the part of the last circuit from the earth, the battery, to the driver <B> 783 </B> is <B> de- </B> signed under the name of, extreme part ". The relays <B> 305 </B> and <B> 806 </B> are excited and the first of these closes by its outer right armature a circuit passing through the earth, the battery, the winding of the electromagnet motor of the combiner <B> 300, </B> the left-sided serial contacts 304, the outer right-hand armature and the relay contact <B> 305, </B> the left armature and the contact of the relay <B> 301 </B> and the earth.

   When the combiner <B> 700 </B> leaves its 2 3/4 position, <B> the </B> previous circuit is open on the extreme part at the upper left serial contact <B> 784. </B> Relays <B> 305 </B> and <B> 306 </B> are neutralized causing the neutralization of the electromagnet <B> 300, </B> which pal, Its left armature brings the combiner # to its third position.



  For the third position of the combiner <B> 700, </B> a circuit is closed <B> to </B> through the earth, the battery, the electromagnet motor of the combination <B> 700, </B> the driver <B> 713, </B> the upper right S & rial contact <B> 717, </B> the driver <B> 789, </B> the serial contact 840, the conductor 841, the outer right armature and the rest contact of the relay <B> 718, </B> the driver <B> 790, </B> the upper left serial con tact <B> 592 .. </B> and the earth.

    The combination <B> 700 </B> leaves his third position and passes <B> to </B> through its positions of the fourth <B> to </B> the eighteenth to the normal.



  For the 33/4 position of the combiner <B> 700, </B> the following circuit is closed <B> - there </B> earth, the battery, the extreme part, the conductor <B> 783, </B> the. upper left contact <B> 755, - </B> the neck doctor <B> 737 </B> (fig. <B> 13 </B> and <B> 16), </B> the left armatures and the rest contacts of the relays <B> 590 </B> and <B> 588, </B> the driver <B> 791, ' </B> the lower left serial contact 743, the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886, </B> the driver <B> 787,

   </B> the serial contact [upper right <B> 788, </B> and the earth. Relay <B> 305 </B> is excited and causes the excitation of the electro-magnet not <B> to </B> not the combiner <B> 300. </B> When the #ombineur <B> 700 </B> leaves its 41/4 position, the above circuit is open, the relay <B> 305 </B> is neutralized, which causes the neutralization of the electromagnet not <B> to </B> not, and the combiner <B> 300 </B> comes to occupy its fourth position.



  For position 51/4 of the combiner <B> 700, </B> a circuit is closed <B> to </B> through earth, battery, relay winding <B> 310, </B> serial contact <B> 311, </B> the conductor 312, the lower inner frame and the contact <B> of </B> work <B> of </B> relay 254, the driver <B> 255, </B> the terminal <B> 67, </B> the brush 45, the lower right and upper left serial contacts 42, the conductors 43 and <B> 37, </B> the upper serial contact 428, <B> - </B> the driver <B> 935, </B> -the frame.

   left-hand interior and the relay contact <B> 930, </B> the lower serial contact 934, the driver- 968, <B> the </B> broom <B> 967, </B> the terminal <B> 966, </B> the conductor -742, the lower right serial contact <B> 851, </B> the driver 834, the serial contact <B> 777, </B> <B> the </B> driver <B> 778, </B> the top serial contaet of.

   right <B> 708, </B> the driver <B> 709 </B> (fig. <B> 13 </B> and <B> 16), </B> the inner left armature and the rest contacts of the relay <B> 562 </B> and working relays 564 and <B> 561, </B> driver 744, the lower right serial contact <B> 712 ' </B> the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886, the </B> driver <B> 787, </B> the upper right serial contact <B> 788, </B> and the earth.

   In the remainder of the description, the part of the circuit above comprised between the earth and the battery, up to the driver <B> 778, </B> is referred to as iiomde,; initial part 41. The relay <B> 310 </B> is excited and closes a circuit <B> to </B> -through the earth, the battery, the winding of the electromagnet not <B> to </B> not <B> of </B> combiner <B> 300, </B> the left-hand serial contacts 304, the armatures and the relay contacts <B> 310 </B> and <B> 301, </B> and the earth, A circuit is also closed <B> to </B> through the earth, the battery,

   the outer right armature and the contact of relay 313, the left winding of relay 314, the conductor <B> 317, </B> the lower serial contact 315, the driver <B> 316, </B> the armatures and the rest contacts of the 305 relay and the working relays <B> 310 </B> and <B> 301., </B> and the earth. Relay 314 is energized and closes its blocking circuit passing through the earth, the battery, the outer right armature and the rest contact of the relay <B> 313, </B> the two series windings of relay 314, the inner armature <B> d </B> th right and the contact of this relay, - the driver <B> 318, </B> and the earth.

    When the combiner <B> 700 </B> leaves his position <B>, 6 </B> 1/4, the relay circuit <B> 310 </B> is open, and the electromagnet not <B> to </B> not being neutralized, the combiner <B> 300 </B> comes to occupy its fifth position.



  * For position <B> 7 </B> 3/4 of the combiner <B> 700, </B> a circuit is completed <B> to </B> through the earth, the battery, the extreme part to the driver <B> 788, </B> the top serial contact <U> -de </U> left <B> 747, </B> conductor 746 (fig. <B> 13 </B> and <B> 16), </B> the left armatures and the rest contacts of the relay <B> 575, </B> and relay work <B> 567, </B> the driver 745, the upper left serial contact of the combiner 743, the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886,

   </B> the driver <B> 787, </B> the upper right serial contact <B> 788, </B> and the earth. Relays 305 and <B> 306 </B> are excited and close the circuit for the electromagnet not <B> to </B> not <B> of </B> combiner <B> 300. </B> When the combiner <B> 700 </B> leaves its 8 '/ 4 position, this circuit is open, which neutralizes the electromagnet not <B> to </B> not and bring the combiner <B> 300 to </B> his sixth position.



  For the position <B> 93/1 </B> of the combiner <B> 700, </B> the following circuit is closed <B>: </B> the earth, the battery, the initial part to the driver <B> 778, </B> the upper right contact <B> 750, </B> driver 749 (fig. <B> 13 </B> and <B> 16), </B> the left armatures and the relay contacts <B> 572, 573 </B> and <B> 571, </B> the driver <B> 748, </B> the lower left serial contact <B> 712, </B> the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 786, </B> the driver <B> 787, </B> the upper right serial con tact .788, and land.

   Relay <B> 310 </B> is excited and closes the circuit of the electromagnet not <B> to </B> not from the combination <B> 800. </B> The relay <B> 310 </B> also closes a circuit passing through the earth, the battery, the left external artery and the rest contact of the relay <B> 319, </B> the left winding of relay 324, the driver <B> 325, the </B> upper left serial contact <B> 315, </B> the driver <B> 316, </B> frames and contacts <B> 805, 310 </B> and <B> 301, </B> and the earth. Relay 324 is energized and by its right armature closes its blocking circuit <B> to </B> through the driver <B> 318 </B> and the earth.



  For- <B> - </B> the position <B> 10 1/8 </B> of the combiner 700y a circuit is closed <B> to </B> through the earth, the battery, the extreme part to the driver <B> 783, </B> the upper left serial contact <B> 750, </B> the conductor 749, and the earth by the circuit previously described. The relays <B> 305 </B> ef <B> 306 <U> ' </U> </B> are excited and close a circuit passing through the earth, the battery, the outer right armature and the contact <B> of </B> relay rest <B> 319, </B> the left winding of relay 320, the driver <B> 321, </B> the upper right contact of the relay <B> 322, </B> the driver <B> 823, </B> the armatures and the relay contacts <B> 306, 310 </B> and <B> 301, </B> and the earth.

   Relay <B> 320 </B> is excited and by attracting its inner right armature closes a blocking circuit <B> to </B> through the driver <B> 318 </B> and the earth.



  For the position <B> 10 </B> 1 / s of the combiner <B> 700, </B> the circuit of the extreme part is open, which causes the neutralization of the relays <B> 305 </B> and <B> 306. </B> A circuit is then closed, <B> to </B> through earth, battery, left winding of relay <B> 319, </B> the outer right armature and the contact of relay 320, the driver <B> 325, </B> the top serial contact <B> 315, </B> the driver <B> 316, </B> the armatures and the relay contacts <B> 805 </B> and <B> 310, </B> the left armature and the relay working contact <B> 301 </B> and the earth. Relay <B> 319 </B> closes by its inner frame (the right its blocking circuit passing through the driver <B> 318 </B> and the earth.

   By its outer right armature, this relay opens the relay blocking circuits <B> 320 </B> and 324, which are neutralized For position 101/4 of the combiner <B> 700, </B> the circuit of the initial part is open causing the neutralization of the electromagnet not <B> to </B> not the combiner <B> 300 </B> which comes to occupy its seventh position.



  For the 113/4 position of the combiner <B> 700, </B> the following circuit is completed <B> - </B> the earth, the battery, the extreme part to the driver <B> 783, </B> the upper left serial contact <B> 755, </B> the driver <B> 737 </B> (fig. <B> 13 </B> and <B> 16), </B> the left armatures and the rest contacts of the relays <B> 579 </B> and <B> 577, </B> the driver 754, the upper left serial contact <B> 712, </B> the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886, </B> the driver <B> 787,

   </B> the upper right serial contact <B> 788, </B> and the earth. The relays <B> 305 </B> and <B> 306 </B> are excited and close a circuit for the electromagnet not <B> to </B> not the combiner <B> 300. </B> When the combiner <B> 700 </B> leaves its 12 '/ 4 position this circuit is open, which causes the neutralization of the electromagnet not <B> to </B> step and movement of the combiner <B> 800 </B> towards its eighth position.



  For the position <B> 13 </B> 3/4 of the combiner <B> 700, </B> a circuit is completed passing through the earth, the battery, the end part to the driver <B> 783, </B> the upper left serial contact <B> 723, </B> the driver <B> 722 </B> (fig. <B> 13 </B> and <B> 16), </B> the internal left-hand fittings and the working contacts of the relays <B> 586 </B> and <B> 581, </B> the driver <B> 793, </B> the upper right serial contact 743, the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886, </B> the driver <B> 787,

   </B> the upper right serial contact <B> 788, </B> and the earth. The relays <B> 305 </B> and <B> 306 </B> are excited and the relay <B> 305 </B> closes the circuit of the combiner electromagnet <B> 300. </B>



  For position 14 They of the combiner <B> 700, </B> a circuit is completed <B> to </B> through the earth, the battery, the initial part to the driver <B> 778, </B> the upper right serial contact <B> 723, </B> the driver <B> 722, </B> the circuit originally drawn and the earth. Relay <B> 310 </B> is activated and closes a circuit passing through the earth, the battery, the left winding of the relay <B> 330, </B> the driver 331, the upper left contact <B> 332, </B> the armatures and the relay contacts <B> 306, 310 </B> and <B> 301, </B> and the earth. Relay <B> 330 </B> is excited, and by its inner right armature closes a blocking circuit <B> to </B> through the driver <B> 318 </B> and the earth.

    When the combiner <B> 700 </B> leaves its 14 '/ 8 position, the relay <B> 310 </B> is neutralized. When the combiner <B> 700 </B> leaves its position 141/14, the circuit of relays 305 and 306 is open, causing the neutralization of the electromagnet not <B> to </B> not the combiner <B> 300, </B> which comes to occupy its ninth position.



  For the 1V / 4 position of the combiner <B> 700, </B> a circuit is completed <B> to </B> through the earth, the battery, the initial part to the driver <B> 778, </B> le, higher serial contact <B> of </B> right <B> 708, </B> the driver <B> 709 </B> (fig. <B> 13 </B> and <B> 16), </B> the armatures and contacts of relays 584, <B> 585 </B> and 5837 the driver <B> 758, </B> the lower right serial contact 743, the driver <B> 711, </B> the lower left serial contact <B> 710, </B> driver 842, the upper left serial contact <B> 886, </B> the driver <B> 787,

   </B> the serial contact on the right <B> 788, </B> and the earth. Relay <B> 310 </B> is excited and close the circuit <B> of </B> the combiner electromagnet <B> 300. </B> Uri circuit is completed <B> to </B> across the earth, <B> the </B> battery, the outer right armature and the rest contact of relay 333, the left winding of relay 334, the conductor <B> 835, </B> the upper left serial contact <B> 329, </B> the armatures and the relay contacts <B> 305, </B> <B> 310 </B> and <B> 301, </B> and the earth.

   Relay 334 is energized, and by its right armature closes a blocking circuit for itself <B> to </B> through the driver <B> 318 </B> and the earth. For the position <B> 16 </B> # / i of the combiner <B> 700, </B> the above circuit is open causing the neutralization of the combiner electromagnet <B> 300, </B> which moves towards its tenth position.



  It should be observed that at this moment the complete number appears in front of the operator of the normal office. The circuit causing the lamp of a thousand to ignite <B> NI, 3 </B> can be drawn as follows <B>: </B> the earth, the battery, the right serial contact <B> 336, </B> the driver 337, the exterior left armor and the rest contacts of the relays 338 and 340, the driver <B> 339, </B> the right middle armature and the working contact of relay 314, the lamp No <B> 3, </B> the inner right armature and the relay contact <B> 338, </B> the driver <B> 318, </B> and the earth.

   The circuit of the Hundreds Lamp No.4 is completed as follows <B>: </B> the earth, the battery, the left serial contact <B> 836, </B> the conductor 341, the external armature on the left and the rest contacts of relays 342 and 320, the middle armature on the right and the rest contact of relay 324, the armature on the left and the make contact relay <B> 319, </B> the driver 344, the lamp No 4, the left inner frame and the working contact <B> of </B> relay <B> 319, </B> conductor 845, left serial contact 346, and earth.

   The tens lamp circuit <B> NI, 5 </B> is closed <B> to </B> through the earth, the battery, the serial contact on the right 347, the conductor 348, the external fittings on the left and the rest contacts of the relays 349 and <B> 851, </B> the middle armature on the right and the rest contact of the relay <B> 327, </B> the external armature on the left and the rest contact of the relay <B> 826, </B> the lamp <B> Ne 5, </B> the left armatures and the rest contacts of the relays <B> 351, 327 </B> and <B> 326, </B> the driver <B> 328, </B> and the earth.

   The lamp circuit of the units No <B> 6 </B> s # establishes as follows <B>: </B> the earth, the battery, the left serial contact 347, the driver <B> 352, </B> the left armature and the contact of the relay <B> 330, </B> the lamp No <B> 6, </B> the right middle armor and the working contact <B> of </B> relay 334, the outer left armature and the rest contact of relay 354, the driver <B> 353, </B> the inner right armature and the relay contact <B> 330, </B> the driver <B> 318, </B> and the earth, The station lamp <B> 0 </B> is also on <B> to </B> through the following circuit,

   to indicate <B> to </B> Operator that the called line is not a shared line <B>: </B> the earth, the battery, <B> the </B> lower left serial contact <B> 381, </B> the lamp <B> 0, </B> the driver <B> 382, </B> the external fittings and the rest contacts of the relays <B> 383 </B> and 384, the lower serial contacts <B> 1380, </B> and the earth. The operator of the central manual office having thus obtained the number of the line requested following the switching on of the lamps, restores her <B> key </B> blocking <B> 259 </B> and insert its file <B> 265 </B> in the <B> jack 266 of </B> the called line. The <B> key 259 </B> opens the relay blocking cil-cuit <B> 301 </B> and 254.

   The first of these closes a circuit passing through the earth, the battery, the electromagnet not <B> to </B> not the combiner <B> 300, </B> 'the armature on the right and the rest contact of this electromagnet, the serial contacts on the left <B> 302, </B> the frame <B> of </B> left and the rest contact of the relay <B> 301, </B> and the earth. The combiner <B> 300 </B> goes from his tenth <B> to </B> its first position. When the combiner <B> 300 </B> leaves its seventeenth position the call indicator blocking circuits <B> to </B> relays are open, which brings this indicator back <B> to </B> its normal position.

   The location of relay 254 completes a circuit passing through the earth, the battery, the left winding of the relay. <B> 251, </B> the right armature and the relay contact <B> 272, </B> the lower armature and the rest contact of relay 254, the driver <B> 255, </B> the terminal <B> 67, </B> le, ba lai 45, the lower right and upper left serial contacts 42, the conductors 43 and <B> 37, </B> the upper serial contact 428, the driver <B> 935, </B> the inner left frame and <B> the </B> relay neutral contact <B> 930, </B> the lower serial contact 934,

   the driver 968 # the broom <B> 967, </B> the terminal <B> 966, </B> the driver 742, <B> the </B> lower serial contact <B> 851, </B> driver 834, <B> the </B> lower serial contact <B> 777, </B> the lower right and upper left serial contacts <B> 598, </B> the driver 599 # the left serial contacts <B> 797, </B> the relay winding <B> 719, </B> and the earth. The relays <B> 251 </B> and <B> 719 </B> are then excited.



  Relay <B> 719 </B> by its armature closes a circuit passing through the earth, the battery, the right winding of the relay <B> 718, </B> the arming and contact of the relay <B> 719, </B> and the earth. A circuit is then closed <B> to </B> through the earth, the battery, the electromagnet motor of the cultivator <B> 900, </B> the driver <B> 920, </B> the lower serial contact <B> of </B> left <B> 932, </B> driver 94S # broom 949, terminal <B> 950, </B> the couplers <B> 951 </B> and <B> 528, </B> the lower left serial contact <B> 529, </B> driver 7801,

       serial contact <B> 701 ', </B> the outer right armature and the working contact of the relay <B> 718, </B> the driver <B> 790, </B> the upper left serial contact <B> 592 </B> and the earth. The coin-cultivator <B> 900 </B> comes to occupy its fifteenth position, and the motor electromagnet circuit of the combiner <B> 10 </B> is closed, which causes this combiner to drop from its eleventh <B> to </B> his thirteenth position.



  As soon as the combiner <B> 10 </B> leaves its eleven position, relay 924 is neutralized and the cable finder <B> To </B> as well as the selector <B> d </B> 'senders <B> 908 </B> come back <B> to </B> their normal position. The relays <B> 719 </B> and <B> 718 </B> are neutralized as soon as the combiner <B> 900 </B> leaves its fourteenth position.

   For position thirteen of the combiiier <B> 10, </B> the following circuit is closed <B>: </B> the earth, the battery, the winding of the relay <B> 275, </B> the upper left winding of the translator 253-, the upper inner frame and the working contact of the relay 254, the conductor <B> 261, </B> the terminal <B> 68, </B> the brush 46, the upper serial contacts 54, the inside left contact of the relay <B> 15, </B> the upper right-hand winding of the translator 55, - and the earth.

   The excitement of the relay <B> 275 </B> closes a circuit passing through the earth, the battery, the relay winding <B> 272, </B> the right winding of the relay <B> 251, </B> the mature ar and the relay contact <B> 275, </B> and earth, which results in energizing the relays <B> 272 </B> and <B> 251. </B>



  As soon as the plug is inserted into the <B> jack </B> <B> 266, </B> a circuit is completed <B> to </B> through the earth, the battery, the lamp <B> 256, </B> the relay windings <B> 257 </B> and 264, the sleeves of the plug <B> 265 </B> and <B> jack 266, </B> the relay winding <B> 267, </B> and the earth. -The relays <B> 257 </B> and 264 attract their frames.

   The lamp <B> 256 </B> is not lit, however, by following the low resistance placed in shunt on its rolling by the following circuit <B> - </B> earth, battery, relay winding <B> 271, </B> matures and relay contacts <B> 263, </B> <B> 280, 257 </B> and <B> 251, </B> and the earth <B> to </B> across the re lais <B> 257, </B> 264 and <B> 267. </B> The relay <B> 271 </B> is excited <B> to </B> through this circuit, and since none of the relays controlling the station light is energized, the relay circuits <B> 262 </B> and <B> 278 </B> are open.



  The inrush current is now sent on the called line <B> to </B> through the circuit from the current source <B> 281, </B> and com take the right winding <B> of </B> relay <B> 280, </B> I armature on the right and the rest contact of the relay <B> 262, </B> the left frame and <B> the </B> relay neutral contact <B> 278, </B> the lower armature and the working contact of the relay <B> 271, </B> the plug rings <B> 265 </B> and <B> jack </B> <B> 266, </B> the station circuit <B> 250, </B> the tips of <B> jack 266 </B> and the file <B> 265, </B> the upper frames and the contacts <B> of </B> re lays 264 and <B> 271; </B> the right armature and the rest contact of the relay <B> 270, </B> and the earth.

    Relay <B> 280 </B> is marginal and is not excited until the called subscriber answers. -When the relay <B> 280 </B> is excited, he removes the relay shunt <B> 263 </B> and this then closes the circuit including <B>: </B> the earth, the battery, the armature and the working contact of the relay <B> 263, </B> the winding of this relay, and the earth <B> to </B> through the relays <B> 257, </B> 264 and <B> 267. </B> This circuit shunts the relay <B> 271, </B> which is neutralized and closes a conversation circuit comprising the earth, the battery, the lower right winding of the translator <B> 253, </B> the running of the relay <B> 268, </B> the lower armature and the rest contact of the relay <B> 271, </B> the ca not of the jack <B> 266, </B> the.poste <B> 250,

   </B> the tips of the jack <B> 266 </B> and the file <B> 265, </B> the upper armatures and the working contacts of relay 264 and resting contacts of the relay <B> 271, </B> the upper right-hand winding of the translator <B> 253, </B> and the earth. Relay <B> 268 </B> is excited and closes a circuit passing through the earth, the battery, the lower right bearing of the translator <B> 55, </B> winding <B> of </B> relay <B> 57, </B> the lower serial contacts 42, the brush 45, the terminal <B> 67, </B> the driver <B> 255, </B> the inner armature and the rest contact of relay 254, the lower left winding of the repeater <B> 253, </B> the winding of the inductor <B> 269,

   </B> the frame and the contact <B> of </B> relay <B> 268, </B> and the earth. Relay <B> 57 </B> is excited and closes the combiner circuit <B> 10 </B> which passes from its thirteenth <B> to </B> his fourteenth position. The conversation circuit is now established between the two station subscribers <B> 1 </B> and <B> 250. </B> When the conversation is over, these subscribers replace the receivers on the switch hooks, which produces the neutralization of the relays 20, <B> 67 </B> and <B> 268, </B> causing lamps to light up <B> 19 </B> and <B> 61 of </B> the way <B> already </B> described.

   The operator at the central office, seeing these lamps on, pulls out plug 4 of the <B> jack 5, </B> and the district selector returns <B> to </B> the normal position. As soon as the -combineur <B> 10 </B> leaves its sixteenth position, the relay circuit <B> 275 </B> is open to higher serial contacts 54. The relay <B> 275 </B> by its neutralization causes that of the relay <B> 251. </B> However the relay <B> 272 </B> is kept excited on the next circuit <B>: </B> the earth, the -battery, the winding of the relay <B> 272, </B> the internal armature and the relay contact <B> 257, </B> resistance <B> 258, </B> and the earth.



  Neutralization of the relay <B> 251 </B> open the shunt placed around the lamp <B> 256 </B> so that this lamp comes on and informs the attendant at the called central office that the conversation is over. This operator therefore removes the file <B> 265 </B> of <B> jack 266, </B> opening the relay circuit <B> 257, </B> 264 and <B> 267 </B> and the lamp <B> 256. </B> Neutralization of the relay <B> 257 </B> opens the relay circuit <B> 272. </B>

 

Claims (1)

CLAIM: Telephone installation comprising a semi-automatic central office, in which the connection between a calling line of this semi-automatic office and a called line belonging <B> to </B> a remote central office, is made under the control of a sending unit, the calling line being connected by an operator <B> to </B> one of its cord circuits, while a series of junction circuits are arranged so <B> to < / B> that each of them can be connected with that of the cord circuits of the position which received the call, in order to choose a free channel unit belonging to a series of similar units, characterized in what everyone says, s junction circuits terminate <B> at </B> a set of seeker switches making the connection with said cord circuit having received the call, so that the latter is connected, <B> to </ B > through this junction circuit, <B> to </B> a senders selector looking for a free sending unit. SUB-CLAIMS: <B> 1 </B> Installation according to claim, characterized in that the searcher switches of the junction circuits are arranged in groups, each cord circuit being able to be connected <B> to </B> one of the coin-mutators researchers (the each group. <B> 2 </B> Installation according to claim and sub-claim <B> 1, </B> in which the cord circuits are arranged in groups, characterized in that each group of seeker switches has access <B > to </B> a different group of cord circuits. <B> 3 </B> Installation according to claim and sub-claims <B> 1 </B> and 2, characterized in that each junction circuit has a sender selector switch which is used <B> for </B> connect this circuit <B> to </B> a free sending unit. 4 Installation according to claim, wherein a set of lines can be connected <B> to </B> another set of lines by means of switches operating mechanically, characterized in that each line of Fun of said sets ends to the movable contacts of a series of said switches. <B> 5 </B> Installation according to claim and sub-claim 4, in which said switches and Fun of the sets of lines are arranged in groups, the switches of each group having common <B> to </ B> a group of lines different from the group of lines to which the switches of any one of 1, # to the three groups have access, characterized in that each of the lines of the other seems to end at the moving contacts of the switch of each group . <B> 6 </B> Installation according to claim and sub-claim 4, characterized in that means are provided by which the switches at the mobile terminals at which a given line terminates are actuated one <B> to < / B> a. <B> 7 </B> Installation according to claim and sub-claims 4 and <B> 6, </B> characterized in that during the operation of one of these switches in the mobile terminals of which the given line ends, the others of said switches are kept idle. <B> 8 </B> Installation according to claim and sub-claims 4 and <B> 6, </B> characterized in that the means for starting any one of said coin-mutators in the mobile terminals from which a given line terminates can only operate if all said switches are in their normal position. <B> 9 </B> Installation according to claim and claims 4, <B> 6 </B> and <B> 8, </B> charac-terized as a circuit start-up for each of said switches passes through a normal contact of each of the other switches in the mobile terminals of which <B> there </B> same line ends. <B> 10 </B> Installation according to claim, in which one of the circuits of one group is arranged to be connected <B> to </B> one of the circuits of another group by means of a pair of switches actuated in response <B> to </B> currents of determined nature passing through said circuits, characterized in that only if one of the switches of said pair cannot perform The maneuver required to establish the connection, the two devices constituting the pair return to idle, and another pair of switches come into action. <B> 11 </B> Installation according to claim and sub-claim <B> 10, </B> characterized in that each pair of switches comprises a cord finder intended <B> to </B> connect one end of a junction circuit <B> to </B> a cord fulfilling the conditions required to answer <B> to </B> a calling subscriber line, and a selector intended <B> to </ B> connect the circuit of a free sending unit <B> to </B> the other end of said junction circuit. 12 Installation according to claim and sub-claims <B> 10 </B> and <B> 11, </B> in which is provided a set of sending units and a control device common to said units but normally disconnected from them, characterized in that electro-magnetic devices, individual <B> to </B> each pair of switches, connect the control device <B> to </B> one of said units , the individual electromagnetic devices <B> to </B> a pair of switches cannot function unless that pair can perform the required maneuver to complete the connection of the conveyor and the cord circuit. <B> 13 </B> Installation according to claim, in which a call is automatically extended by means of a variable operation <B> </B> sending unit, operating on a sending circuit comprising a circuit junction having a selector of senders <B> at </B> one end to connect the unit, and a seeker switch <B> at </B> the other end to connect the jofiction circuit <B > to </B> an appropriate line for transmitting the call, characterized in that a variable adjustment <B> to </B> control device is arranged <B> to </B> to be connected <B> to </B> said sending unit by a circuit extending <B> through </B> through said selector but not <B> through </B> through said seeker coin-mutator. 14 Installation according to claim, in which calls are extended under the control of a variable functioning <B> to </B> sending unit, automatically chosen from a series of similar units by one of the selector switches of senders of a series of similar devices, characterized in that each of said sender selector switches is provided with electro-magnetic devices for connecting <B> to </B> said unit of send a variable operating <B> to </B> command device, normally disconnected from all said units. <B> 15 </B> Installation according to claim and sub-claim 14, characterized in that said switches are arranged in groups, each group comprising a device for controlling <B> </B> units with variable operation , individual <B> to </B> this group. <B> 16 </B> Installation according to claim and sub-claim 14, characterized in that individual electromagnetic means <B> to </B> a selector of senders <B> - </B> work only "when this selector has completed its connection <B> to </B> a free unit. <B> 17 </B> Installation according to claim, in which means are provided for actuating one of the switches of a series of sender selector switches arranged in groups to choose a sending unit <B> to </ B > variable operation, characterized in that a series of variable adjustable <B> </B> sender controller devices are provided, each of which is individual <B> to </B> a group of switches sender selectors. <B> 18 </B> Installation according to claim and sub-claim <B> 17, </B> characterized in that these electro-inagri # tiqLies means are provided to operate during the choice of the unit by the voyeur selector switch, and this ends up connecting <B> to </B> said unit the control device which is individual to the group to which said selector switch belongs. <B> 19 </B> An installation according to claim, wherein calls are extended from an operator cord circuit <B> to </B> a selectively operating switch at which said circuit terminates, by means of 'a controller device normally disconnected from this switch, this connection between the controller device and the switch being made by a seeker switch, characterized in that said selectively operating switch operates by means acting in response to the pulses of A control circuit extending from said control device to said cord finder switch, and comprising at said cord finder switch an electromagnetic <B> </B> device for controlling said means. Installation according to claim and sub-claim <B> 19, </B> characterized in that a series of selectively operating switches are provided, and in each of which a separate cord circuit terminates, said seeker switch being arranged to <B> </B> connect the desired circuit of said lead circuits to said control device. 21 Installation according to claim and sub-claims <B> 19 </B> and 20, characterized in that said seeker switches are smaller in number than said selectively operating switches. 22 Installation according to claim and sub-claims <B> 19 to </B> 21, characterized in that said electromagnetic device comprises an individual relay <B> at </B> each seeker switch. <B> 23 </B> Installation according to claim, in which a call is extended <B> to </B> such a selector device operating under the control of a series of relays <B> to </B> successive action, characterized in that means are provided for actuating one of said relays in order to control said selector apparatus as a result of the operation of one of said relays chosen from the series. 24 Installation according to claim and sub-claim <B> 23, </B> characterized in that means are provided for actuating the last relay of said. series as a result of the operation of one of the relays chosen from among the other relays of said series. <B> 25 </B> Installation according to claim comprising an arrangement of circuits in which a series of successively acting <B> </B> relays are actuated by a series of pulses and in which on operation of the last relay of this series, a means controlling a control circuit is actuated, characterized in that one of said relays is first actuated and in that a variable number of successive relays are then actuated. <B> 26 </B> Installation according to claim and sub-claim <B> 25, </B> characterized in that said relays are arranged in two groups operating successively, a variable number of relays in a group being actuated if the number of pulses in a series does not exceed a determined value, and a variable number of relays in said group and all relays of the other group being actuated, if the number of pulses in said series exceeds the determined value. <B> 27 </B> Installation according to claim and sub-claims <B> 25 </B> and <B> 26, </B> characterized in that said means controlling the controller circuit operates only when all the relays corresponding to <B> to </B> a series of pulses have been activated. 28 Installation according to claim, in which a call is extended in accordance with <B> </B> the operation of a group of recorders, and in which a switching device is provided for connecting the recorders in said group. successively with a sender, which is also connected <B> to </B> a control circuit for controlling a second switching device in order to extend the call, characterized in that means are provided for actuating the first said switching devices, and connecting the registrars of said group successively with said control circuit independently of said sender, in order to control a third switching device. 29 Installation according to claim and the sou s-reven di cation <B> 28, </B> characterized in that said third switching device controls a name indicator device. <B> 30 </B> Installation according to claim, in which calls are extended by means of a sending device, characterized in that this device can be connected to at least <B> to </B> two of the switching devices , one of which controls means for producing series of pulses actuating said sender, and the other is actuated by series of pulses produced by means associated with said sender. <B> 31 </B> Installation according to claim, in which an automatic selector switch is arranged so as <B> to </B> first select one of the groups of a series of groups of outgoing lines, and then a line in the selected group, this switch also being able to operate in such a way <B> to </B> restoring to idle the devices used for a connection, characterized in that a single control device is arranged to control any of the- say operations of said "switch.