History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 114
by the relay, and the armature of the electro-mag-net on the left, being released, is drawn up against the flat spring,which it lifts from the binding-screw, breaking the main circuiton the right. Before, however, the armature reaches the spring,the arm attached to it strikes the arm which projects… … 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
Telegraph
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