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Just prior to World War II, a standard 90-degree battery-operated flashlight was adopted for the U.S. Army with the designation TL-122. [4] The TL-122 was itself a slightly altered version of the angle-head, brass-bodied Eveready Model No. 2694 Industrial flashlight and the No. 2697 Boy Scout flashlight, first introduced in 1927.
Level crossing signals are electronic warning devices for road vehicles at railroad level crossings. Level crossings can be operated in various ways. In some countries such as the UK, the warning devices are more often than not activated by remote control, I.e. an operator pressing buttons. However, the majority of countries have automated systems.
Reed Switch. The hermetically sealed reed switch is a common type of two-piece sensor. This switch operates with an electrically conductive switch that is either normally open or normally closed when under the influence of a magnetic field in respect to proximity to the second piece, which contains a magnet.
Each distant signal had its own battery, operating at 12.5 V or more; the resistance if the power came directly from the controlling signal box was thought too great (the locomotive equipment required 500 mA). Instead, a 3 V circuit from a switch in the signal box operated a relay in the battery box. When the signal was at 'caution' or 'danger ...
The battery backups can operate the controller in emergency mode with the red light flashing or in fully functional mode. In 2004, California Energy Commission recommended to have local governments to convert their traffic lights to LEDs with battery backups. This would lower the energy consumption and enhance the safety at major intersections.
The ideal warning light must be able to power itself while clamped to a single wire of the line. Lights may be powered either from the electric field surrounding the energized wire, or the magnetic field produced by current through the wire.