History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 101
to the relay (Fig. 41),which consists of an electro-magnet, the wire of which is placedby the extremities in communication with the telegraphic line ;so that this electro-magnet operates under the action of the cur-rent transmitted from one station to the other. The soft ironarmature is attached to… … nicates by means of a metal column and a wire conductor withone pole of a local battery ; the other pole of this battery commu- THE MORSE SYSTEM. 83 nicates, by the intervention of the wire of the electro-magnet ofthe registering apparatus and of the spring, with the metal lever.When the…
Telegraph
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