FR485168A - Photometer - Google Patents

Photometer

Info

Publication number
FR485168A
FR485168A FR485168DA FR485168A FR 485168 A FR485168 A FR 485168A FR 485168D A FR485168D A FR 485168DA FR 485168 A FR485168 A FR 485168A
Authority
FR
France
Prior art keywords
photometer
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
Clayton Laing
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 FR485168A publication Critical patent/FR485168A/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
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/22—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using a variable element in the light-path, e.g. filter, polarising means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR485168D 1917-04-20 1917-04-20 Photometer Expired FR485168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR485168T 1917-04-20

Publications (1)

Publication Number Publication Date
FR485168A true FR485168A (en) 1917-12-19

Family

ID=1521897

Family Applications (1)

Application Number Title Priority Date Filing Date
FR485168D Expired FR485168A (en) 1917-04-20 1917-04-20 Photometer

Country Status (1)

Country Link
FR (1) FR485168A (en)

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