GB571290A - Improvements relating to light signalling apparatus - Google Patents
Improvements relating to light signalling apparatusInfo
- Publication number
- GB571290A GB571290A GB1472643A GB1472643A GB571290A GB 571290 A GB571290 A GB 571290A GB 1472643 A GB1472643 A GB 1472643A GB 1472643 A GB1472643 A GB 1472643A GB 571290 A GB571290 A GB 571290A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- lamp
- action
- regulated
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
- G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
- G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Traffic Control Systems (AREA)
Abstract
571,290. Light regulating. CHANCE BROS., Ltd., and HOLMES, J. G. Sept. 8, 1943, No. 14726. [Class 40 (iii)] The intensity of an electric lamp f employed as a beacon for guiding aviators &c. is regulated as required by atmospheric conditions by action of light from the lamp or another lamp in the same circuit reaching a photo-electric cell a through the atmosphere, the cell a being arranged in a bridge circuit to act differentially with respect to a cell b which is illuminated by a standard source g and is 'not affected by atmospheric conditions. A cell c may also be provided responsive to sky conditions, this cell serving, for example, to cause the brightness of lamp f to increase as general illumination increases. Cell c may also operate a relay k for switching sources f and g off at full daylight and on when daylight declines. The regulated source may comprise a number of lamps which are put into and out of action as required.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1472643A GB571290A (en) | 1943-09-08 | 1943-09-08 | Improvements relating to light signalling apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1472643A GB571290A (en) | 1943-09-08 | 1943-09-08 | Improvements relating to light signalling apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB571290A true GB571290A (en) | 1945-08-17 |
Family
ID=10046392
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1472643A Expired GB571290A (en) | 1943-09-08 | 1943-09-08 | Improvements relating to light signalling apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB571290A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3126521A (en) * | 1964-03-24 | Visibility measurement |
-
1943
- 1943-09-08 GB GB1472643A patent/GB571290A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3126521A (en) * | 1964-03-24 | Visibility measurement |
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