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Stepping switch. In electrical engineering, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths, directed by a train of electrical pulses. The major use of stepping switches was in early automatic telephone exchanges to route ...
The reed switch[ i] is an electromechanical switch operated by an applied magnetic field. It was invented in 1922 by professor Valentin Kovalenkov at the Petrograd Electrotechnical University, [ 1] and later evolved at Bell Telephone Laboratories in 1936 by Walter B. Ellwood into the reed relay.
The station is in St Cuthbert Out civil parish, approximately 2 miles (3.2 km) north-east of Wells. Its mast, 293 m (961 ft) high, was built in 1967 and is the tallest structure in South West England. The mast broadcasts digital television, FM analogue radio and DAB digital radio, and had broadcast analogue colour television from 1967 until 2010.
The combination of a low-output 4.2 L (255 cu in) Windsor V8 base engine and a C5 three-speed transmission with 2.26 rear gears robbed the car of any performance. The optional 131 hp (98 kW), 302 cu in (4.9 L) Windsor V8, coupled with the optional AOD automatic overdrive transmission and optional 3.45 rear-end ratio, showed only moderate ...
Relay. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.
A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts. Owing to environmental considerations about the toxicity of mercury, mercury ...
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