History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 299
ent. Theearth, having a surplus of bothkinds, neutralizes the two fluidswithout loss, presenting, in fact,the same result as if the two endsof the wire were united. To illustrate: — Suppose a wireextending between Boston and New York required twentyGroves cups to produce a certain influence upon an… … Fig. 82. CONSTRUCTION OF TELEGRAPH LLNES. 281 take the same length of wire, and make the circuit from NewYork to Hartford and return, and the length of the circuit will beonly 230 miles; but it will require precisely the same amount ofelectro-motive force in the battery, or, in other words, the…
Telegraph
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