GB496968A - Improvements in and relating to photographic exposure meters - Google Patents

Improvements in and relating to photographic exposure meters

Info

Publication number
GB496968A
GB496968A GB1632937A GB1632937A GB496968A GB 496968 A GB496968 A GB 496968A GB 1632937 A GB1632937 A GB 1632937A GB 1632937 A GB1632937 A GB 1632937A GB 496968 A GB496968 A GB 496968A
Authority
GB
United Kingdom
Prior art keywords
instrument
scales
parent specification
photographic exposure
carrying
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
GB1632937A
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.)
EDGAR HAROLD WALTER BANNER
General Electric Co PLC
Original Assignee
EDGAR HAROLD WALTER BANNER
General Electric Co PLC
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 EDGAR HAROLD WALTER BANNER, General Electric Co PLC filed Critical EDGAR HAROLD WALTER BANNER
Priority to GB1632937A priority Critical patent/GB496968A/en
Publication of GB496968A publication Critical patent/GB496968A/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)
  • Details Of Measuring And Other Instruments (AREA)

Abstract

496,968. Photo -electric exposure meters. GENERAL ELECTRIC CO., Ltd., TURNER, H. C., and BANNER, E. H. W. June 11, 1937, No. 16329. Addition to 458,695, [Group XX]. [Class 40 (iii)] In a photographic exposure meter of the kind claimed in the parent Specification, comprising an indicating instrument 2 having a linear characteristic, the movable member carrying two of the scales (i.e. the disc shown in the parent Specification as carrying the aperture and platespeed scales) is arranged to actuate a variable resistance 15 which shunts the instrument and which is graded so that for regular movements of the said member the pointer 5 of the instrument moves irregularly, its movement being proportional to a special characteristic such as the logarithm of the output current of the photoelectric cell 1. This arrangement is stated to give greater accuracy than with the prior device in which the magnet poles and/or core are specially shaped to make the instrument logarithmic.
GB1632937A 1937-06-11 1937-06-11 Improvements in and relating to photographic exposure meters Expired GB496968A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1632937A GB496968A (en) 1937-06-11 1937-06-11 Improvements in and relating to photographic exposure meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1632937A GB496968A (en) 1937-06-11 1937-06-11 Improvements in and relating to photographic exposure meters

Publications (1)

Publication Number Publication Date
GB496968A true GB496968A (en) 1938-12-09

Family

ID=10075322

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1632937A Expired GB496968A (en) 1937-06-11 1937-06-11 Improvements in and relating to photographic exposure meters

Country Status (1)

Country Link
GB (1) GB496968A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745508C (en) * 1941-08-08 1944-04-19 Julius Stille Device for determining the exposure time for photographic recordings
DE1177474B (en) * 1961-02-04 1964-09-03 Elbe Kamera Gmbh Photographic camera with photoelectric exposure control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE745508C (en) * 1941-08-08 1944-04-19 Julius Stille Device for determining the exposure time for photographic recordings
DE1177474B (en) * 1961-02-04 1964-09-03 Elbe Kamera Gmbh Photographic camera with photoelectric exposure control device

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