GB428387A - Improvements relating to the projection of light - Google Patents

Improvements relating to the projection of light

Info

Publication number
GB428387A
GB428387A GB3159233A GB3159233A GB428387A GB 428387 A GB428387 A GB 428387A GB 3159233 A GB3159233 A GB 3159233A GB 3159233 A GB3159233 A GB 3159233A GB 428387 A GB428387 A GB 428387A
Authority
GB
United Kingdom
Prior art keywords
foci
light
floodlight
adjustable
pair
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
GB3159233A
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.)
HERBERT CHRISTOPHER WHEAT
Edison Swan Electric Co Ltd
Original Assignee
HERBERT CHRISTOPHER WHEAT
Edison Swan Electric Co Ltd
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 HERBERT CHRISTOPHER WHEAT, Edison Swan Electric Co Ltd filed Critical HERBERT CHRISTOPHER WHEAT
Priority to GB3159233A priority Critical patent/GB428387A/en
Publication of GB428387A publication Critical patent/GB428387A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

428,387. Floodlight &c. lamps. EDISON SWAN ELECTRIC CO., Ltd., 123, Queen Victoria Street, London, and WHEAT, H. C., Bloxham, West Drive, Harrow Weald Park, Middlesex. Nov. 13, 1933, No. 31592. [Class 75 (iv)] In a floodlight or like lamp comprising a point source of light and a pair of projectors adapted to project parallel beams, the projectors are so arranged that their foci do not quite coincide and the light source is adjustable between the foci. In the form shown, the light source is adjustable between the foci 3, 4 of a pair of truncated parabolic reflectors 1, 2 having a common axis AA.
GB3159233A 1933-11-13 1933-11-13 Improvements relating to the projection of light Expired GB428387A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3159233A GB428387A (en) 1933-11-13 1933-11-13 Improvements relating to the projection of light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3159233A GB428387A (en) 1933-11-13 1933-11-13 Improvements relating to the projection of light

Publications (1)

Publication Number Publication Date
GB428387A true GB428387A (en) 1935-05-13

Family

ID=10325431

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3159233A Expired GB428387A (en) 1933-11-13 1933-11-13 Improvements relating to the projection of light

Country Status (1)

Country Link
GB (1) GB428387A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944570C (en) * 1947-02-21 1956-06-21 British Thomson Houston Co Ltd Lighting fixture for tubular light sources with a pair of trough-shaped reflectors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944570C (en) * 1947-02-21 1956-06-21 British Thomson Houston Co Ltd Lighting fixture for tubular light sources with a pair of trough-shaped reflectors

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