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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
G01J1/48—Photometry, e.g. photographic exposure meter using chemical effects
G01J1/54—Photometry, e.g. photographic exposure meter using chemical effects by observing photo-reactions between gases
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FR822389D1936-09-031936-09-03Procédé et dispositifs d'utilisation de l'énergie thermique
ExpiredFR822389A
(fr)