Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 285
act that the resistance of fine metalfilings is enormously diminished by electric waves. If aglass tube, partly filled with filings, called a coherer^ isconnected, as indicated in Fig. 174, in series with a celland a telegraph sounder, no current of consequence willpass through the tube, if the… … Fig. 174. For practical purposes, however, the effect of the wavemust be intensified. This may be done by attaching toone wire of the coherer a vertical wire, with one end con-nected with the earth and the other extending upward toa height depending on the distance the message is to betransmitted.…
Physics
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