GB517120A - Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor - Google Patents

Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor

Info

Publication number
GB517120A
GB517120A GB21213/38A GB2121338A GB517120A GB 517120 A GB517120 A GB 517120A GB 21213/38 A GB21213/38 A GB 21213/38A GB 2121338 A GB2121338 A GB 2121338A GB 517120 A GB517120 A GB 517120A
Authority
GB
United Kingdom
Prior art keywords
electric switches
relating
illumination devices
photographic purposes
switches therefor
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
GB21213/38A
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
Priority to GB21213/38A priority Critical patent/GB517120A/en
Publication of GB517120A publication Critical patent/GB517120A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Push-Button Switches (AREA)

Abstract

517,120. Foot operated electric switches. LOMAX, J. July 18, 1938, No. 21213. [Class 38 (v)] A spring-retracted button depressed by the operator's foot changes connections from series to parallel and changes them back again when the button is released. The device serves as a switch for lamps illuminating photographic subjects.
GB21213/38A 1938-07-18 1938-07-18 Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor Expired GB517120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB21213/38A GB517120A (en) 1938-07-18 1938-07-18 Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21213/38A GB517120A (en) 1938-07-18 1938-07-18 Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor

Publications (1)

Publication Number Publication Date
GB517120A true GB517120A (en) 1940-01-22

Family

ID=10159084

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21213/38A Expired GB517120A (en) 1938-07-18 1938-07-18 Improvements in or relating to illumination devices for photographic purposes, and electric switches therefor

Country Status (1)

Country Link
GB (1) GB517120A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147466A (en) * 1960-06-09 1964-09-01 French Oil Mill Machinery Pilot light system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3147466A (en) * 1960-06-09 1964-09-01 French Oil Mill Machinery Pilot light system

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