FR721177A - Instrument for measuring exposure time - Google Patents

Instrument for measuring exposure time

Info

Publication number
FR721177A
FR721177A FR721177DA FR721177A FR 721177 A FR721177 A FR 721177A FR 721177D A FR721177D A FR 721177DA FR 721177 A FR721177 A FR 721177A
Authority
FR
France
Prior art keywords
instrument
exposure time
measuring exposure
measuring
time
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
Hans Ferdinand Tonnies
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 filed Critical
Application granted granted Critical
Publication of FR721177A publication Critical patent/FR721177A/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
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR721177D 1930-08-16 1931-08-10 Instrument for measuring exposure time Expired FR721177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE721177X 1930-08-16

Publications (1)

Publication Number Publication Date
FR721177A true FR721177A (en) 1932-02-29

Family

ID=6629263

Family Applications (1)

Application Number Title Priority Date Filing Date
FR721177D Expired FR721177A (en) 1930-08-16 1931-08-10 Instrument for measuring exposure time

Country Status (1)

Country Link
FR (1) FR721177A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751203C (en) * 1936-07-02 1952-09-22 Hans Ferdinand Toennies Photoelectric light meter attached to a photographic camera

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE751203C (en) * 1936-07-02 1952-09-22 Hans Ferdinand Toennies Photoelectric light meter attached to a photographic camera

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