History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 508
t is closed and the other open. This local con-nection may be traced by the dotted fine, beginning at c, thence tothe lever s of the sounder S, through the screw p, through the localmagnet L, thence to the zinc pole of the local battery B, throughwhich it passes ; thence from its platina pole to… … circuit brings into action the magnet L, which attracts the left-handend of the lever I, bringing the insulated screw in connection withthe spring h, thus changing the course of the eastern main line di- 490 THE PROGRESS OF THE ELECTRIC TELEGRAPH. rectly to the ground by the wire G, instead of…
Telegraph
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