Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 257
Earth Fig. 143, … circuit of small resistance, the current is strong and thesound is much louder. Thus it will be seen, as hasbeen stated, that the relay is an automatic key, and thatthe current in the line needs only to be strong enough toattract A, thus completing the local circuit. 387. The Duplex and…
Physics
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