History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 115
Fig. 46. Fig. 47. the relay, but the detent which it threw under the opposite arma- 96 ELECTRIC TELEGRAPH APPARATUS. ture is held there by friction until the relay on the right has timeto operate. The circuit on the right in closing closes the localcircuit, and releases the detent, which is drawn… … Fig. 48. left, it being held by the detent until it is released by the closingof its own relay, which also closes the repeating armature.
Telegraph
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