History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 69
etwo extremities that are not united form in this case the twopoles. The currents that are obtained by means of the mag-neto-electrical machine differ from the ordinary currents of vol-taic electricity in two respects: the first is, that they are dis-continuous; the second, that they move… … Fig. 30. duced by means of these induced currents, by one as well as bythe others, are very energetic. We can ignite a platinum wire,and can even obtain a small luminous arc between two points ofcoke. The chemical effects are very decided at the first instant;but the two gases liberated alternately…
Telegraph
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