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The advent of miniature lights found the adaptation of twinkle bulbs as flasher bulbs, which interrupt the entire series circuit of anywhere from 10 to 50 bulbs when powered from 120-volt mains electricity (in North America). These are easily recognizable by their red tips on an otherwise unpainted clear white bulb, and are available in the ...
Modern cars now use a relaxation oscillator and solid-state relay built into the body control module to flash the lights, and use speakers to produce the distinctive clicking sound associated with turn signals, [53] which was previously made by a relay or the leaf spring in a thermal flasher. If the stalk switch is not moved beyond the fixed ...
A relay Electromechanical relay principle Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts An automotive-style miniature relay with the dust cover taken off. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple ...
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Headlight flashing might have come into more common use as a means of attempting driver-to-driver communication by the mid-1970s, [3] when cars began to come with headlight beam selectors located on the steering column—typically activated by pulling the turn signal stalk—rather than the previous foot-operated pushbutton switches.
This requirement for a new system of plugs and sockets led to the publishing in 1947 of "British Standard 1363:1947 Fused-Plugs and Shuttered Socket-Outlets". [43] One of the other recommendations in the report was the introduction of the final ring circuit system (often informally called a "ring main"). In this arrangement a cable connected to ...
Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. A coded panel is similar in many ways to a modern conventional panel (described below), except each zone was connected to its own code wheel, which, depending on the way the panel was set up, would either do sets of four rounds of code until the initiating pull station was reset ...
The 2002 Winter Olympics torch relay was a 65-day run, from December 4, 2001, until February 8, 2002, prior to the 2002 Winter Olympics. [1] The runners carried the Olympic Flame throughout the United States – following its lighting in Olympia, Greece , to the opening ceremony of the 2002 games at Rice-Eccles Stadium in Salt Lake City, Utah .