GB474482A - Improvements in and relating to street lighting fittings - Google Patents
Improvements in and relating to street lighting fittingsInfo
- Publication number
- GB474482A GB474482A GB21257/36A GB2125736A GB474482A GB 474482 A GB474482 A GB 474482A GB 21257/36 A GB21257/36 A GB 21257/36A GB 2125736 A GB2125736 A GB 2125736A GB 474482 A GB474482 A GB 474482A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dish
- prisms
- sides
- refracting
- reflector
- 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)
Abstract
474,482. Street lamps. HOLOPHANE, Ltd., and ENGLISH, S. July 31, 1936, No. 21257. [Classes 75 (ii) and 75 (iv)] A street-lighting fitting designed so as to give no indication of its existence or location to aircraft comprises a lantern having a'shallow transparent dish 2 with refracting or diffusing prisms on its sides and base, and a reflector 3 surrounding the light source 1 and arranged to reflect light on to the sides of the dish and an outer opaque shield or reflector 8 giving an absolute cut-off along or below the horizontal plane. The run 9 of the shield should be level with or below the lowest point of the dish 2 which for this reason is made shallow. The interior surface of the sides of the dish may carry diffusing prisms or refracting prisms for directing the light into prefered directions. In order to prevent the illumination of buildings, the outer surface of the dish mav be formed with a group of horizontal refracting prisms on the side facing the road, and with a group of reflecting prisms on the other side. Either the bulb or the dish may be coloured blue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21257/36A GB474482A (en) | 1936-07-31 | 1936-07-31 | Improvements in and relating to street lighting fittings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB21257/36A GB474482A (en) | 1936-07-31 | 1936-07-31 | Improvements in and relating to street lighting fittings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB474482A true GB474482A (en) | 1937-11-02 |
Family
ID=10159855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB21257/36A Expired GB474482A (en) | 1936-07-31 | 1936-07-31 | Improvements in and relating to street lighting fittings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB474482A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2566126A (en) * | 1947-08-19 | 1951-08-28 | Holophane Co Inc | Street lighting luminaire |
| US2612600A (en) * | 1947-08-12 | 1952-09-30 | Joslyn Mfg And Supply Company | Open type luminaire with easily removable reflector |
-
1936
- 1936-07-31 GB GB21257/36A patent/GB474482A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2612600A (en) * | 1947-08-12 | 1952-09-30 | Joslyn Mfg And Supply Company | Open type luminaire with easily removable reflector |
| US2566126A (en) * | 1947-08-19 | 1951-08-28 | Holophane Co Inc | Street lighting luminaire |
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