Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 654
neral use. THE STEARHS BlPtEX. The operation of differential relays like M in the diagram of the quadru-plex, by alternations of no battery and battery, is the principle ofthe Stearns duplex which, as the first condenser-using, and therefore static-eliminating duplex in the world, has a certain… … 642 TELEGRAPHY. by the Western Union Telegraph Company, a duplex, New York to Albany— all without condensers. In March, 1872, the Stearns Duplex, with con-denser, went into operation between New York and Chicago, but it has beensuperseded by the polar system. Reverting to the diagram, the…
Electrical engineering
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