History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 61
fixed and the other movable, they are mutually attractive when theyare moving in the same direction, and repulsive when they are mov-ing in a contrary direction. The attraction in this case does notcease with contact, as occurs when we are referring to the attrac-tion of electric bodies in static… … Fig 23. MAGNETISM. 43 duces magnetization just as a magnet would do. He alwaysfound that, in order to impress a more decided magnetism upona steel needle, it was necessary to employ a conductor bent intoa helix, within the axis of which heplaced the needle, instead of usingthe rectilinear current…
Telegraph
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