GB251340A - Improvements in lamp signalling devices particularly for use in controlling traffic - Google Patents
Improvements in lamp signalling devices particularly for use in controlling trafficInfo
- Publication number
- GB251340A GB251340A GB266925A GB266925A GB251340A GB 251340 A GB251340 A GB 251340A GB 266925 A GB266925 A GB 266925A GB 266925 A GB266925 A GB 266925A GB 251340 A GB251340 A GB 251340A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- lamp
- switch
- mercury
- casing
- 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
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
251,340. Bilby, F. W. C. Jan. 30, 1925. Mercury switches. - A hand-lamp signalling- device comprising a casing A in which is an electric lamp E, is connected to a pocket battery K or like source of electricity by removable leads M<2>, M<3>, an automatic gravity-operated switch G containing mercury being arranged in the lamp casing so as to complete the electric circuit only when the hand is in the horizontal position or is raised above that position. The terminals c, c<1> and contact strip C are insulated from the casing, and the automatic switch G is placed between the casing and a spring H<1> connected to the terminal c'. The switch comprises a glass tube having metal end caps g<4>, g<5> connected to contacts g<6>, g<7> respectively in the tube and spaced so that mercury in the tube bridges the contacts when the hand is raised above the horizontal position to complete the circuit to the lamp. Alternatively, the switch may comprise a glass tube containing mercury, the tube being closed at one end through which is inserted a metal strip, the other end being closed by an insulated sleeve in which is a metal block, the strip and block being spaced and are adapted to be bridged by the mercury when the hand is raised. The Provisional Specification states that the switch mav comprise a metal tube instead of the glass tube and metal strip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB266925A GB251340A (en) | 1925-01-30 | 1925-01-30 | Improvements in lamp signalling devices particularly for use in controlling traffic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB266925A GB251340A (en) | 1925-01-30 | 1925-01-30 | Improvements in lamp signalling devices particularly for use in controlling traffic |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB251340A true GB251340A (en) | 1926-04-30 |
Family
ID=9743675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB266925A Expired GB251340A (en) | 1925-01-30 | 1925-01-30 | Improvements in lamp signalling devices particularly for use in controlling traffic |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB251340A (en) |
-
1925
- 1925-01-30 GB GB266925A patent/GB251340A/en not_active Expired
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