Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 286
system, such as is used in telegraphing withoutwires. B is the battery of the transmitter, whicli chargesthe induction-coil J; ^is the contact key, which regulatesthe sparks of the coil; B the discharging apparatus, calledthe oscillator, with its wires W extending upward a hun-dred feet or more and… … relay ; aSthe sounder; and E an ordinary bell, used as adecoherer, which is in parallel with the sounder, and shouldbe muffled or have the gong removed. When the contact key is closed, the current enters thecoil, and a spark passes across the balls of D. This sendsout an electric wave which,…
Physics
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