History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 433
ould fall,and great mechanical effects would be produced, — such as the35* 414 EARLY DISCOVERIES LN ELECTRO-DYNAMICS. ringing of church-bells at the distance of many miles, an illustra-tion which I had previously given to my class. My impressionis strong, that I had explained this precise process… … • Fig. 96. ringing bells at a distance by the use of the electro-magnet, andof having frequently illustrated the principle to my class, bycausing, in some cases, a thousand pounds to fall a few inches onthe floor, by merely lifting a piece of wire from two cups of mer-cury, closing the circuit. The…
Telegraph
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