GB458695A - Improvements in or relating to photographic exposure meters - Google Patents

Improvements in or relating to photographic exposure meters

Info

Publication number
GB458695A
GB458695A GB2092135A GB2092135A GB458695A GB 458695 A GB458695 A GB 458695A GB 2092135 A GB2092135 A GB 2092135A GB 2092135 A GB2092135 A GB 2092135A GB 458695 A GB458695 A GB 458695A
Authority
GB
United Kingdom
Prior art keywords
pointer
scale
scales
fixed
exposure
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
GB2092135A
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 GB2092135A priority Critical patent/GB458695A/en
Publication of GB458695A publication Critical patent/GB458695A/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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Instructional Devices (AREA)

Abstract

458,695. Photo - electric exposure meters. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, and BANNER, E. H. W., c/o Salford Electrical Instruments, Ltd., Silk Street, Salford, Lancashire. July 23, 1935, No. 20921. [Class 98 (i)] The meter is provided with a calculator having scales of plate-speeds, exposure times, and apertures, one scale being fixed and the others carried by a movable member mounted so that any mark on one of them can be moved into register with the pointer of an indicating instrument connected to the cell, the other scale then moving over the fixed scale. The scales are subdivided so that equal steps correspond to doubling of the exposure and the indicating instrument is constructed with a logarithmic characteristic by suitably shaping the poles and /or core. In the form shown, the pointer 5 of the instrument is visible in a window 4 at the rear. A scale 14 of exposure times is fixed to the casing and a disc bearing scales of apertures 13 and plate-speeds 11 is pivoted thereon. A pointer 12 is movable over the scale 11. In use the pointer 12 is set to the selected plate-speed and the disc then rotated to bring the pointer into register with the pointer 5. The casing has an aperture provided with a grid so that the angle of the light incident on the cell is limited. A viewing hole 7 is provided to enable the meter to be directed at the object.
GB2092135A 1935-07-23 1935-07-23 Improvements in or relating to photographic exposure meters Expired GB458695A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2092135A GB458695A (en) 1935-07-23 1935-07-23 Improvements in or relating to photographic exposure meters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2092135A GB458695A (en) 1935-07-23 1935-07-23 Improvements in or relating to photographic exposure meters

Publications (1)

Publication Number Publication Date
GB458695A true GB458695A (en) 1936-12-24

Family

ID=10154044

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2092135A Expired GB458695A (en) 1935-07-23 1935-07-23 Improvements in or relating to photographic exposure meters

Country Status (1)

Country Link
GB (1) GB458695A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2590165A (en) * 1948-11-05 1952-03-25 Polaroid Corp Brightness meter
US2648254A (en) * 1947-09-30 1953-08-11 Gen Electric Logarithmic exposure meter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648254A (en) * 1947-09-30 1953-08-11 Gen Electric Logarithmic exposure meter
US2590165A (en) * 1948-11-05 1952-03-25 Polaroid Corp Brightness meter

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