History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 505
The linesthroughout the Northern and Western States continued to use thebutton arrangement in some form, whenever they had occasion totelegraph direct between points too widely separated to permit thesuccessful operation of a single circuit. The first repeater brought into practical use,… … Fig. 100. In this repeater (Fig. 100) a simple mechanical arrangement isemployed to prevent the circuit of the transmitting operator frombeing broken by the action of the repeating lever on the opposite sideof the apparatus ; and the services of the button or switch, and of theperson employed to…
Telegraph
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