FR540242A - Photometric apparatus - Google Patents

Photometric apparatus

Info

Publication number
FR540242A
FR540242A FR540242DA FR540242A FR 540242 A FR540242 A FR 540242A FR 540242D A FR540242D A FR 540242DA FR 540242 A FR540242 A FR 540242A
Authority
FR
France
Prior art keywords
photometric apparatus
photometric
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
Arthur Howland
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 FR540242A publication Critical patent/FR540242A/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)
FR540242D 1914-04-27 1921-09-02 Photometric apparatus Expired FR540242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US540242XA 1914-04-27 1914-04-27

Publications (1)

Publication Number Publication Date
FR540242A true FR540242A (en) 1922-07-07

Family

ID=21988288

Family Applications (1)

Application Number Title Priority Date Filing Date
FR540242D Expired FR540242A (en) 1914-04-27 1921-09-02 Photometric apparatus

Country Status (1)

Country Link
FR (1) FR540242A (en)

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