FR379810A - Actino-photometer to determine the exposure time in photography - Google Patents

Actino-photometer to determine the exposure time in photography

Info

Publication number
FR379810A
FR379810A FR379810DA FR379810A FR 379810 A FR379810 A FR 379810A FR 379810D A FR379810D A FR 379810DA FR 379810 A FR379810 A FR 379810A
Authority
FR
France
Prior art keywords
actino
photometer
photography
exposure time
exposure
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)
Inventor
Jules Decoudun
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR379810A publication Critical patent/FR379810A/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
    • G01J1/48—Photometry, e.g. photographic exposure meter using chemical effects
    • G01J1/50—Photometry, e.g. photographic exposure meter using chemical effects using change in colour of an indicator, e.g. actinometer
FR379810D 1907-07-11 1907-07-11 Actino-photometer to determine the exposure time in photography Expired FR379810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR379810T 1907-07-11

Publications (1)

Publication Number Publication Date
FR379810A true FR379810A (en) 1907-11-20

Family

ID=1426065

Family Applications (1)

Application Number Title Priority Date Filing Date
FR379810D Expired FR379810A (en) 1907-07-11 1907-07-11 Actino-photometer to determine the exposure time in photography

Country Status (1)

Country Link
FR (1) FR379810A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487792A1 (en) * 1989-09-11 1992-06-03 Patent Innovations Limited Ultra-violet light detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0487792A1 (en) * 1989-09-11 1992-06-03 Patent Innovations Limited Ultra-violet light detector

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