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A limit switch with a roller-lever operator; this is installed on a gate on a canal lock, and indicates the position of a gate to a control system A limit switch mounted on a moving part of a bridge In electrical engineering , a limit switch is a switch operated by the motion of a machine part or the presence of an object.
Using the Telcordia standards for circuit naming allow a LEC the ability to build a certain amount of intelligence into the name of a circuit. The way Telcordia has developed circuit IDs, different types of circuit connections require different formats for the circuit ID. In each format, different segments of the ID have very specific meaning.
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At the furnace, cool air passes into the furnace, usually through an air filter, through the blower, then through the heat exchanger of the furnace, whence it is blown throughout the building. One major advantage of this type of system is that it also enables easy installation of central air conditioning , simply by adding a cooling coil at the ...
Low-water cutoff: It is a mechanical means (usually a float switch) or an electrode with a safety switch that is used to turn off the burner or shut off fuel to the boiler to prevent it from running once the water goes below a certain point. If a boiler is "dry-fired" (burned without water in it) it can cause rupture or catastrophic failure.
A remote subscriber loop carrier cabinet. A subscriber loop carrier or subscriber line carrier (SLC) provides telephone exchange-like telephone interface functionality. SLC remote terminals are typically located in areas with a high density of telephone subscribers, such as a residential neighborhood, or very rural areas with widely dispersed customers, that are remote from the telephone ...
In effect, the formula reduces the legal weight limit for shorter trucks with fewer axles (see table below). For example, a 25-foot (7.6 m) three-axle dump truck would have a gross weight limit of 54,500 pounds (24,700 kg), instead of 80,000 pounds (36,000 kg), which is the standard weight limit for 63-foot (19.2 m) five-axle tractor-trailer. [1]
1898: The mosquito identified as the carrier of malaria by Sir Ronald Ross (1857–1932). 1901: Amino acid Tryptophan discovered by Frederick Gowland Hopkins (1861–1947). 1902: First typhoid vaccine developed by Almroth Wright (1861–1947). [92] 1912: Vitamins discovered by Frederick Gowland Hopkins (1861–1947).