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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
G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
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Spectroscopy & Molecular Physics
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FR542107D1920-10-231921-10-08Appareil indiquant le temps de pose pour l'obtention de clichés photographiques
ExpiredFR542107A
(fr)