GB376952A - Improvements in or relating to exposure meters for photographic purposes - Google Patents

Improvements in or relating to exposure meters for photographic purposes

Info

Publication number
GB376952A
GB376952A GB20358/31A GB2035831A GB376952A GB 376952 A GB376952 A GB 376952A GB 20358/31 A GB20358/31 A GB 20358/31A GB 2035831 A GB2035831 A GB 2035831A GB 376952 A GB376952 A GB 376952A
Authority
GB
United Kingdom
Prior art keywords
light
relating
photographic purposes
exposure meters
responsive
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
GB20358/31A
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.)
HANS FERDINAND TONNIES
Original Assignee
HANS FERDINAND TONNIES
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 HANS FERDINAND TONNIES filed Critical HANS FERDINAND TONNIES
Publication of GB376952A publication Critical patent/GB376952A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00Photometry, e.g. photographic exposure meter
    • G01J1/42Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • G01J1/4214Photoelectric 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)
  • Structure And Mechanism Of Cameras (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

376,952. Light-sensitive cells. TONNIES, H. F., 18, Schenkendorfstrasse, Gross- Flottbek, Altona, Germany. July 15, 1931, No. 20358. Convention date, Aug. 16, 1930. Drawings to Specification. [Class 40 (iii).] In a photographic exposure meter use may be made of a light activated cell comprising selenium and selenium oxide which is relatively more responsive to red and yellow light, copper and copper-oxide cells being relatively more responsive to green light.
GB20358/31A 1930-08-16 1931-07-15 Improvements in or relating to exposure meters for photographic purposes Expired GB376952A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE376952X 1930-08-16

Publications (1)

Publication Number Publication Date
GB376952A true GB376952A (en) 1932-07-21

Family

ID=31895481

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20358/31A Expired GB376952A (en) 1930-08-16 1931-07-15 Improvements in or relating to exposure meters for photographic purposes

Country Status (1)

Country Link
GB (1) GB376952A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE741456C (en) * 1933-10-29 1943-11-11 Ig Farbenindustrie Ag Camera with electric light meter
DE748130C (en) * 1933-11-22 1944-10-27 Device for dimming sidelights in photoelectric light meters
DE748204C (en) * 1934-07-08 1944-10-28 Electric light meter
DE751203C (en) * 1936-07-02 1952-09-22 Hans Ferdinand Toennies Photoelectric light meter attached to a photographic camera

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE741456C (en) * 1933-10-29 1943-11-11 Ig Farbenindustrie Ag Camera with electric light meter
DE748130C (en) * 1933-11-22 1944-10-27 Device for dimming sidelights in photoelectric light meters
DE748204C (en) * 1934-07-08 1944-10-28 Electric light meter
DE751203C (en) * 1936-07-02 1952-09-22 Hans Ferdinand Toennies Photoelectric light meter attached to a photographic camera

Similar Documents

Publication Publication Date Title
GB376952A (en) Improvements in or relating to exposure meters for photographic purposes
GB333820A (en) Improvements in or relating to the manufacture of light-sensitive layers
GB375916A (en) Improvements in and relating to photo-electric cells
GB345317A (en) Arrangement for the conversion of variations of light intensity into variations of electric working conditions
GB459277A (en) Improvements in and relating to photometers for measuring illumination
GB407755A (en) Improvements in photo-electric cells
GB276092A (en) Improvements in or relating to light meters for photographic purposes
GB350414A (en) Photographic roll films
GB446010A (en) Improvements in cameras fitted with exposure meters
AU1783629A (en) Improvements in and relating to colour photography
AU101561B2 (en) Improvements in and relating to water meters
AU3038130B (en) Improvements in and relating to color photography
AU233931A (en) Improvements in exposure indicator attachments to photographic cameras
AU1776729A (en) Improvements in and relating to colour photography and colour cinematography
GB259687A (en) An apparatus for indicating or detecting electrically the reception of light
AU274836A (en) Improvements in and relating to water meters
GB426517A (en) Improvements in and relating to dry surface contact rectifiers
AU1853434A (en) Improvements in and relating to prepayment mechanism of electricity and like meters
GB459760A (en) Improvements in and relating to lithographic re-transfer paper
AU267126A (en) Improvements in and relating to water meters
AU2603830B (en) Improvements in and relating to light sensitive devices
AU2036129A (en) Improvements in and relating to meter seals
AU478831A (en) Improvements in and relating to wet gas meters
AU1206128A (en) Manufacture of azo-dyestuffs insoluble in water
AU2305129A (en) Manufacture of azo-dyestuffs insoluble in water