FR717520A - Appareil pour la comparaison des intensités lumineuses - Google Patents

Appareil pour la comparaison des intensités lumineuses

Info

Publication number
FR717520A
FR717520A FR717520DA FR717520A FR 717520 A FR717520 A FR 717520A FR 717520D A FR717520D A FR 717520DA FR 717520 A FR717520 A FR 717520A
Authority
FR
France
Prior art keywords
light intensities
comparing light
comparing
intensities
light
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
Application number
Other languages
English (en)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Radiovisor Foreign & Colonial
Original Assignee
Radiovisor Foreign & Colonial
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 Radiovisor Foreign & Colonial filed Critical Radiovisor Foreign & Colonial
Application granted granted Critical
Publication of FR717520A publication Critical patent/FR717520A/fr
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/34—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker
    • G01J1/36—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker using electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR717520D 1930-05-24 1931-05-22 Appareil pour la comparaison des intensités lumineuses Expired FR717520A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB717520X 1930-05-24

Publications (1)

Publication Number Publication Date
FR717520A true FR717520A (fr) 1932-01-09

Family

ID=10494724

Family Applications (1)

Application Number Title Priority Date Filing Date
FR717520D Expired FR717520A (fr) 1930-05-24 1931-05-22 Appareil pour la comparaison des intensités lumineuses

Country Status (1)

Country Link
FR (1) FR717520A (fr)

Similar Documents

Publication Publication Date Title
FR761302A (fr) Appareil photophonographique
FR713236A (fr) Appareil électrolytique
FR723700A (fr) Appareil de teinture
FR749585A (fr) Appareil de sauvetage pour naufragés
FR687806A (fr) Appareil cinématographique
FR734420A (fr) Appareil de filtration
FR619665A (fr) Mano-propulseur pour embarcations légères
FR766700A (fr) échelle plane pour appareil de t. s. f.
FR691595A (fr) Appareil de filtration
FR703868A (fr) Appareil de filtration
FR706207A (fr) Appareil de filtration
FR705528A (fr) Appareil pour traiter les chapeaux par la vapeur
FR689066A (fr) Appareil d'électro-culture
FR753206A (fr) Appareil photophonographique
FR727974A (fr) Appareil pour refroidir de la vapeur
FR628367A (fr) Appareil pour la teinture des cloches de chapellerie
FR719773A (fr) Appareil pour la respiration artificielle
FR684383A (fr) Appareil perfectionné pour la galvanoplastie
FR709612A (fr) Appareil de béchage
FR727294A (fr) Appareil cinématographique
FR613748A (fr) Appareil réflecteur-répartiteur de lumière
FR611011A (fr) Instrument pour lumière scintillante
FR609487A (fr) Appareil pour projections cinématographiques
FR698834A (fr) Appareil pour la vérification des engrenages
FR688944A (fr) Appareil de sécurité pour cycles