Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 195
FIG. 131. — The telegraph key. spring S raises the arma-ture 7 and the bar B. B … FIG. 132.—The telegraph relay. then strikes the screw C andmakes another click. The message is sent by dotsand dashes. A dot is a shorttime between clicks. A dash isdouble the time of a dot and adouble dash, treble the time.The key (Fig. 131) is used to sendthe message, by starting and stopping the…
Physics · Home Economics
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