History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 60
If the conjunctive wire be not placed parallel to the needle, but MAGNETISM. 41 in such a manner that its direction forms, with that of the needle,either above or below it, a greater or less angle, the action is stillthe same; the needle in like manner manifests its tendency toplace itself across… … Fig. 22. M. Ampere was not long in taking up this experiment, anddeducing from it many theoretical and experimental consequencesof the highest interest, which, under the name of electro-dynamics,have formed an entirely new part of physics. He observed thatthe action discovered by Oersted not only…
Telegraph
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