History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 503
will likewise be drawnback by the action of their adjusting springs, and assume the positionshown in the diagram. Changing the position of the armature ahas the effect of reversing the mairu^attery B of the eastern line,placing its negative pole in connection with the line, and its positivewith the… … station eastdesires to communicate with some office on the westerncircuit. He presses down his key, which is so arranged as to form aconnection between the fine-wire and the ground at his office, thus THE PROGRESS OF THE ELECTRIC TELEGRAPH. 485 cutting off the remote battery. The current of the…
Telegraph
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