FR717520A - Apparatus for comparing light intensities - Google Patents

Apparatus for comparing light intensities

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
French (fr)
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/en
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 Apparatus for comparing light intensities Expired FR717520A (en)

Applications Claiming Priority (1)

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

Publications (1)

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

Family

ID=10494724

Family Applications (1)

Application Number Title Priority Date Filing Date
FR717520D Expired FR717520A (en) 1930-05-24 1931-05-22 Apparatus for comparing light intensities

Country Status (1)

Country Link
FR (1) FR717520A (en)

Similar Documents

Publication Publication Date Title
FR761302A (en) Photophonographic apparatus
FR717520A (en) Apparatus for comparing light intensities
FR713236A (en) Electrolytic apparatus
FR723700A (en) Dyeing apparatus
FR749585A (en) Rescue apparatus for castaways
FR687806A (en) Cinematographic apparatus
FR734420A (en) Filtration apparatus
FR619665A (en) Mano-thruster for light craft
FR766700A (en) flat ladder for t apparatus. s. f.
FR691595A (en) Filtration apparatus
FR706207A (en) Filtration apparatus
FR703868A (en) Filtration apparatus
FR705528A (en) Apparatus for steaming hats
FR689066A (en) Electro-culture apparatus
FR753206A (en) Photophonographic apparatus
FR727974A (en) Apparatus for cooling steam
FR628367A (en) Apparatus for dyeing hat bells
FR719773A (en) Device for artificial respiration
FR684383A (en) Advanced device for electroplating
FR709612A (en) Spotting apparatus
FR727294A (en) Cinematographic apparatus
FR613748A (en) Light reflector-distributor
FR611011A (en) Twinkling light instrument
FR609487A (en) Apparatus for cinematographic projections
FR698834A (en) Apparatus for checking gears