FR321456A - Apparatus for measuring the degree of illumination at any time - Google Patents

Apparatus for measuring the degree of illumination at any time

Info

Publication number
FR321456A
FR321456A FR321456DA FR321456A FR 321456 A FR321456 A FR 321456A FR 321456D A FR321456D A FR 321456DA FR 321456 A FR321456 A FR 321456A
Authority
FR
France
Prior art keywords
illumination
measuring
degree
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
Schoeler Felix
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 FR321456A publication Critical patent/FR321456A/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)
FR321456D 1902-05-28 1902-05-28 Apparatus for measuring the degree of illumination at any time Expired FR321456A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR321456T 1902-05-28

Publications (1)

Publication Number Publication Date
FR321456A true FR321456A (en) 1903-01-10

Family

ID=1371884

Family Applications (1)

Application Number Title Priority Date Filing Date
FR321456D Expired FR321456A (en) 1902-05-28 1902-05-28 Apparatus for measuring the degree of illumination at any time

Country Status (1)

Country Link
FR (1) FR321456A (en)

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