US1900117A - Sundial - Google Patents

Sundial Download PDF

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Publication number
US1900117A
US1900117A US261335A US26133528A US1900117A US 1900117 A US1900117 A US 1900117A US 261335 A US261335 A US 261335A US 26133528 A US26133528 A US 26133528A US 1900117 A US1900117 A US 1900117A
Authority
US
United States
Prior art keywords
sundial
disc
place
meridian
march
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US261335A
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English (en)
Inventor
Francesco Loria
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US1900117A publication Critical patent/US1900117A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B49/00—Time-pieces using the position of the sun, moon or stars
    • G04B49/02—Sundials

Definitions

  • the Sundial in accordance with the present nventlon is provlded' with a hearing which permitsit to be easilysetup or taken to pieces, and which permits setting it promptly t Fig. 1, which showsthe goniometer and the .55
  • Each of these series is formed by two circular plates having the form of a cup, whose-hour lines may be applied on each face of the disc. which constitutes the sundial,'so that for each one of the two faces there are two plates.
  • One plate will bear for instance the hour 'llIlQS'fIOIIl March 21stt0 June Qlstand the other, the hour lines fromtlune 21st to SeptemberZlst.
  • another plate will bear the indications from SeptemberQlst to December 21st, and the last plate will bear'the hour lines from December 21st to March 21st.
  • Fig. l- is a front view of'the universal sundialin accordance with the inventlon, whlch 1s supposed to be placed vertically, viz. at the Equator with theplate marked for the period from March 21st to June 21st. 1
  • Fig. 2 is an axial section of the sundial sup- I posed to be inclined at the latitude of 42.
  • FIG.3 is a sea view of the sundial with the plate niarkejd for the period from une 21st to September 21st.
  • Fig. 5 is aplan in accordance with the section C1.D;of Fig. 2.
  • Fig. 6 isa partial view on In the Northern Hemisphere the two plates March 21stSeptember',2lst must beplaced on the upper face of the disc, and the other two, September 21st.;to March, 21st, on the lower face. The contrary must be done if the sundial is set up in the Southern I-Iemisphere. v p
  • the apparatus is'made up of atriangular base -1 to be hired on supports or pillars made 'with, bricks, stone, iron or Wood and which carries-at its centre a pin 2-whose end is threaded and't'o' which a nut 3 is screwed in order toseoure'in place a frame to be fixed I on a plate or supporting member 4 after this plate has been placed exactly horizontally.
  • the frame is then put in place by introducing the plate 4 upon the pivot 2 of the base and by directing the point towards the north or the south according to circumstances.
  • T ienut 3 is put on the pivot 2 without screwing it completely up; the plate t is perfectly levelled in all directions and afterwards the nut 8 is screwedup until it adheres to the plate 4.
  • the shaft 5 is placed into the frame and on this shaft is arranged the disc 7 already provided with its season plates.
  • Figs. 2 and 6 represent for instance the sundial at the latitude of 42.
  • the disc is then fixed by screwing up the two screws 17 17 near the shaft 5, until the two segments of circle 16 are fixed firmly to the said shaft.
  • the disc When the latitude of the place is not known 7 the disc must be directed towards the sun and at midday it must be put in such a position that the shadow of the style fails on the day circle corresponding to the day of the operation. For instance, if the day is April 13th, the disc must be put in such a positlon that the shadow of thestyle falls on the circle of- April 13th. When this has been done, the sundial is placed at the latitude ofthe place and the goniometer 16 will give the corresponding indication. I
  • the slate 11 with its small rod 12 is put on the south part'of the plate, and after having' levelled it in every direction, from a small hole13 which is arranged in the upper part of the rod 12 a plumb 14 is dropped in a vertical direction and the resulting .point is marked.
  • This point is taken as the centrefor describing two or three arcs of a circle as large as the slateallows.
  • the day circles on the different circular plates' may be marked for every day, instead of for a period of days, as for the sake of simplicity it has been shown on the drawings, and in this case the sundial may also form a calendar.
  • a supporting member an upright bearer upon said member, a disc mounted upon the bearer for angular adjustment wherebyit may be inclined in accordance with the latitude of the place where the instrument is to be used, the disc bearing upon its face, indiciaindicating hours and fractions of hours, a style' positioned axially of the disc to cast its shadow, under sunlight rays, on to the face of the disc the bearing being rotatable for adjustment of the disc in accordance with the adopted meridian, means for holding the bearer in its positions of adjustment, a slate mounted upon the supporting member opposite the bearer, and a plumb suspended above the said slate.
  • a supporting member an upright bearer upon said member, a cup shaped disc mounted upon the bearing member for angular adjustment whereby it may be inclined in accordance with the latitude of the place Where the instrument is to be used, the bearing member rotatable, means for holding the member in positions of rotative adjustment, means in juxaposition to the bearing member and bearing a scale concentric to the axis of rotation of the said member, a pointer carried by the said bearing member, the disc bearing upon its face, indicia indicating hours and fractions of hours, and a style positioned axially of the disc to cast its shadow, under sunlight rays, on to the face of the disc.

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  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Clocks (AREA)
  • Instructional Devices (AREA)
  • Tents Or Canopies (AREA)
  • Finger-Pressure Massage (AREA)
US261335A 1928-01-30 1928-03-13 Sundial Expired - Lifetime US1900117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT681146X 1928-01-30

Publications (1)

Publication Number Publication Date
US1900117A true US1900117A (en) 1933-03-07

Family

ID=11307943

Family Applications (1)

Application Number Title Priority Date Filing Date
US261335A Expired - Lifetime US1900117A (en) 1928-01-30 1928-03-13 Sundial

Country Status (6)

Country Link
US (1) US1900117A (it)
BE (1) BE362225A (it)
CH (1) CH138361A (it)
DE (1) DE521101C (it)
FR (1) FR681146A (it)
GB (1) GB328579A (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765977B1 (fr) * 1997-07-09 1999-08-20 Jean Alphonse Gerard Jegu Cadran solaire de jardin ou salon, a lecture directe de l'heure g.m.t., complet, reglable et transportable

Also Published As

Publication number Publication date
BE362225A (fr) 1929-08-31
CH138361A (it) 1930-02-28
FR681146A (fr) 1930-05-09
DE521101C (de) 1931-03-18
GB328579A (en) 1930-04-29

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