GB516012A - Improvements in or relating to lanterns for electric lamps - Google Patents

Improvements in or relating to lanterns for electric lamps

Info

Publication number
GB516012A
GB516012A GB18072/38A GB1807238A GB516012A GB 516012 A GB516012 A GB 516012A GB 18072/38 A GB18072/38 A GB 18072/38A GB 1807238 A GB1807238 A GB 1807238A GB 516012 A GB516012 A GB 516012A
Authority
GB
United Kingdom
Prior art keywords
reflectors
lanterns
relating
electric lamps
vertical
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
GB18072/38A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB18072/38A priority Critical patent/GB516012A/en
Publication of GB516012A publication Critical patent/GB516012A/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
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures
    • 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
    • F21V7/005—Reflectors for light sources with an elongated shape to cooperate with linear light sources
    • 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
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/10—Outdoor lighting
    • F21W2131/103—Outdoor lighting of streets or roads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Abstract

516,012. Street &c. lamps. BRITISH THOMSON-HOUSTON CO., Ltd., MAXTED R.; and BERTRAM, J. June 17, 1938, No. 18072. [Classes 75 (ii) and 75 (iv)] Reflectors 3 above a source of light 1 and reflectors 4 at the sides thereof and forming part of side reflectors 5, 4. 6, are so arranged that upward rays are directed by the former on to the latter, and from the latter redirected in an angular beam beneath the source preferably between 66 and 77 degreees to the vertical. Preferably the reflectors 4 are plane, and the reflectors 5, 6 curved, the latter giving a cut-off of light at 75 degrees to the vertical.
GB18072/38A 1938-06-17 1938-06-17 Improvements in or relating to lanterns for electric lamps Expired GB516012A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB18072/38A GB516012A (en) 1938-06-17 1938-06-17 Improvements in or relating to lanterns for electric lamps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18072/38A GB516012A (en) 1938-06-17 1938-06-17 Improvements in or relating to lanterns for electric lamps

Publications (1)

Publication Number Publication Date
GB516012A true GB516012A (en) 1939-12-20

Family

ID=10106170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18072/38A Expired GB516012A (en) 1938-06-17 1938-06-17 Improvements in or relating to lanterns for electric lamps

Country Status (1)

Country Link
GB (1) GB516012A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008006A1 (en) * 1978-08-04 1980-02-20 Siemens Aktiengesellschaft Indoor lighting fixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0008006A1 (en) * 1978-08-04 1980-02-20 Siemens Aktiengesellschaft Indoor lighting fixture

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