GB371991A - An improved method of and apparatus for street lighting - Google Patents
An improved method of and apparatus for street lightingInfo
- Publication number
- GB371991A GB371991A GB5170/31A GB517031A GB371991A GB 371991 A GB371991 A GB 371991A GB 5170/31 A GB5170/31 A GB 5170/31A GB 517031 A GB517031 A GB 517031A GB 371991 A GB371991 A GB 371991A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reflector
- envelope
- light
- holophane
- class
- 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
- F21V5/02—Refractors for light sources of prismatic shape
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
371,991. Reflectors for street lamps. HOLOPHANE, Ltd. and ENGLISH, S., Holophane House, Elverton Street, Vincent Square, London. Feb. 18, 1931, No. 5170. [Class 75 (ii).] A reflector entirely covered with reflecting prisms and adapted to cut off the direct view of the lamp filament for about 15‹ below the horizontal, is enclosed in a light diffusing envelope 5 adapted to be illuminated by the light which passes through the reflector. The reflector may be elliptical in horizontal section so as to reflect the major portion of the light in two main beams. The envelope may be of opal or frosted glass, or of clear glass with diffusing prisms 6 on the interior or exterior, and rests upon a flange 2 of the reflector, a washer 3 rendering the joint dustproof. For use at cross-roads the envelope may be coloured or a colour screen may be inserted between the two pieces of the unit. Specification 111,986, [Class 75 (ii), Lamp chimneys &c.], is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5170/31A GB371991A (en) | 1931-02-18 | 1931-02-18 | An improved method of and apparatus for street lighting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5170/31A GB371991A (en) | 1931-02-18 | 1931-02-18 | An improved method of and apparatus for street lighting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB371991A true GB371991A (en) | 1932-05-05 |
Family
ID=9790994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5170/31A Expired GB371991A (en) | 1931-02-18 | 1931-02-18 | An improved method of and apparatus for street lighting |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB371991A (en) |
-
1931
- 1931-02-18 GB GB5170/31A patent/GB371991A/en not_active Expired
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