Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 182
lines of force in thisfield will vary; or, by a clearer way of expressing it, the field offorce will expand and contract accordingly. This expansion andcontraction of the field will cause its lines of force to cut the tele-phone wire, and will by the laws of electromagnetic induction causecurrents… … FIG. 140.—MAGNETIC LINES AROUND A CONDUCTOR. and again destroyed, with every complete cycle of the current.This is the condition for a maximum disturbance in the telephone Electrostatic induction may be explained by reference to Fig.141, where a grounded telephone line is shown running parallelwith…
Telephone
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