GB511619A - Improvements in lighting fittings - Google Patents
Improvements in lighting fittingsInfo
- 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
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.
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) |
-
1938
- 1938-04-08 GB GB10793/38A patent/GB511619A/en not_active Expired
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