History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 58
steds fundamental experiment: —Unite the two poles of a battery by a wire. Place above orbelow this wire a mag-netized needle, freelysuspended, and paral-lel to its direction (Fig.20). The needle im-mediately suffers a de-viation, which is themore considerable asthe voltaic pile is themore… … Fig. 20. 40 PRELDHNARY NOTIONS. deviation depends upon two circumstances : the first is the positionof the conjunctive wire in relation to the magnetized needle, —
Telegraph
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