History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 114
Fig. 44. Fig. 45. Now if the circuit on the left be again closed, the armature ofthe repeating magnet on that side will also close by the action of … 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…
Telegraph
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