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GB481656A - Improvements in photo-electric exposure meters - Google Patents

Improvements in photo-electric exposure meters

Info

Publication number
GB481656A
GB481656A GB2756837A GB2756837A GB481656A GB 481656 A GB481656 A GB 481656A GB 2756837 A GB2756837 A GB 2756837A GB 2756837 A GB2756837 A GB 2756837A GB 481656 A GB481656 A GB 481656A
Authority
GB
United Kingdom
Prior art keywords
photo
opening
exposure meters
cell
side opening
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
GB2756837A
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.)
Metrawatt AG
Original Assignee
Metrawatt AG
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 Metrawatt AG filed Critical Metrawatt AG
Priority to GB2756837A priority Critical patent/GB481656A/en
Publication of GB481656A publication Critical patent/GB481656A/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
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214—Photoelectric exposure meters for determining the exposure time in recording or reproducing specially adapted for view-taking apparatus

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

481,656. Photo - electric exposure meters. DIXON, H. E. (Metrawatt Akt.- Ges. Fabrik Elektrischer Messgeraete) Oct. 11, 1937, No. 27568. [Class 40 (iii)] Relates to exposure meters comprising a photo-electric cell band a direct current meter a, and consists in providing the casing with a front opening c and a side opening d to be used aternatively for two different ranges of measurement. The front opening c may be closed by a pivoted shutter f, the back of which may reflect or diffuse light from the side opening on to the cell. The edge g of the side opening may also be made to reflect or diffuse light on to the cell; and this opening may be closed by an elastic cap.
GB2756837A 1937-10-11 1937-10-11 Improvements in photo-electric exposure meters Expired GB481656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2756837A GB481656A (en) 1937-10-11 1937-10-11 Improvements in photo-electric exposure meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2756837A GB481656A (en) 1937-10-11 1937-10-11 Improvements in photo-electric exposure meters

Publications (1)

Publication Number Publication Date
GB481656A true GB481656A (en) 1938-03-15

Family

ID=10261727

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2756837A Expired GB481656A (en) 1937-10-11 1937-10-11 Improvements in photo-electric exposure meters

Country Status (1)

Country Link
GB (1) GB481656A (en)

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