Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 256
han two stations on the line, all of the sounderson the line repeat the message. 386. The Relay. — When telegraph lines are very long,the resistance becomes so great that it is a difficult matter to get strength of current tomake the clicks loud enoughto be easily heard, so therelay system is… … Fig. 142. 242 ELECTRICITY [§§ 386-388 When K is closed and K open, if Y presses his key, therelay R will become magnetized, attract JL, drawing itagainst the contact C, and thus complete the local circuit.This magnetizes xS, causing a click, which correspondsto the sound produced by the relay; but,…
Physics
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