FR841857A - Device for measuring illuminance - Google Patents

Device for measuring illuminance

Info

Publication number
FR841857A
FR841857A FR841857DA FR841857A FR 841857 A FR841857 A FR 841857A FR 841857D A FR841857D A FR 841857DA FR 841857 A FR841857 A FR 841857A
Authority
FR
France
Prior art keywords
measuring illuminance
illuminance
measuring
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
Musset Antoine Joannes
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 FR841857A publication Critical patent/FR841857A/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
    • G01J1/38—Photometry, e.g. photographic exposure meter using wholly visual means
    • G01J1/40—Photometry, e.g. photographic exposure meter using wholly visual means using limit or visibility or extinction effect

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
FR841857D 1938-02-01 1938-02-01 Device for measuring illuminance Expired FR841857A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR841857T 1938-02-01

Publications (1)

Publication Number Publication Date
FR841857A true FR841857A (en) 1939-05-31

Family

ID=9310270

Family Applications (1)

Application Number Title Priority Date Filing Date
FR841857D Expired FR841857A (en) 1938-02-01 1938-02-01 Device for measuring illuminance

Country Status (1)

Country Link
FR (1) FR841857A (en)

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