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GABRIEL CROMER
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GABRIEL CROMER
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Application filed by GABRIEL CROMERfiledCriticalGABRIEL CROMER
Application grantedgrantedCritical
Publication of FR438168ApublicationCriticalpatent/FR438168A/en
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
FR438168D1911-12-201911-12-20
Sliders giving exactly the exact draw and iris for focusing
ExpiredFR438168A
(en)