History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 26
on so volatile, and its insulation so difficult, thatthe problem of the electric telegraph could be considered only as ascientific conception without the discovery of dynamic electricity. In 1800, the curious discoveries of Galvani conducted Voltato the discovery of electric currents, and their… … rig. 1. Dr. Coxe, an American, about the same time, proposed a tele-graph, the principle of which consisted in the decomposition ofchemicals by the electric current. Mr. Francis Ronalds, in 1816, constructed a telegraph, bywhich he was able to send signals with considerable facility andrapidity…
Telegraph
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