History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 518
Fig. 107. 42, 43 exhibit drawings of the olden pattern of sounders, now butlittle used. … Fig. 108. The increase of telegraphy in this country has been so great thatthe manufacture of submarine cables and insulated wire of all kindsused in the business has become a large and important branch ofAmerican industry. The Bishop Gutta-Percha Company of NewYork, under the management of Samuel…
Telegraph
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