A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 459
rth bya ground wire. The registering apparatus R, is connected inthe circuit of the local battery L, as shown.The contacts are made by the end B, of the leverB B, attached to the armature A, of the electro-magnet M M. Relay Bell.—(See Bell, Relay, Electric?, Relay, Box-Sounding Telegraphic —A relay… … Fig. 479. Box-Sounding Relay relay containing two differentially wound coilsof wire on its magnet cores. When the currents which pass through thesetwo coils are of the same strength, there is nomovement of the armature, since the fields of thetwo coils neutralize each other. The differential relay…
Electricity · Electrical engineering
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