GB511619A - Improvements in lighting fittings - Google Patents

Improvements in lighting fittings

Info

Publication number
GB511619A
GB511619A GB10793/38A GB1079338A GB511619A GB 511619 A GB511619 A GB 511619A GB 10793/38 A GB10793/38 A GB 10793/38A GB 1079338 A GB1079338 A GB 1079338A GB 511619 A GB511619 A GB 511619A
Authority
GB
United Kingdom
Prior art keywords
prisms
sets
intensity
source
light
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
GB10793/38A
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.)
General Electric Co PLC
Original Assignee
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB10793/38A priority Critical patent/GB511619A/en
Publication of GB511619A publication Critical patent/GB511619A/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
    • F21V5/00—Refractors for light sources

Landscapes

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

Abstract

511,619. Street &c. lamps. GENERAL ELECTRIC CO., Ltd., and BEGGS, S. S. April 8, 1938; No. 10793. [Class 75 (ii)] A street lamp or like directional lighting fitting of the kind which produces a maximum light intensity in a direction highly inclined to the vertical, is provided, below the source 4, with a shallow glass bowl 1 bearing two sets of prisms 2, 3, the edges of each set lying in parallel vertical planes and the vertical planes of one set being substantially perpendicular to those of the other set. The two sets of prisms may either both spread the light so as to make the intensity in the vertical direction less than it would be from the bare source, or both concentrate the light to make this intensity greater than it would be from the bare source. The sets of prisms may be on the same or opposite faces of the bowl 1, or the latter may be constituted by two portions each carrying one set of prisms. The subject-matter of Specification 511,615 is disclaimed.
GB10793/38A 1938-04-08 1938-04-08 Improvements in lighting fittings Expired GB511619A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB10793/38A GB511619A (en) 1938-04-08 1938-04-08 Improvements in lighting fittings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10793/38A GB511619A (en) 1938-04-08 1938-04-08 Improvements in lighting fittings

Publications (1)

Publication Number Publication Date
GB511619A true GB511619A (en) 1939-08-22

Family

ID=9974354

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10793/38A Expired GB511619A (en) 1938-04-08 1938-04-08 Improvements in lighting fittings

Country Status (1)

Country Link
GB (1) GB511619A (en)

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