Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 26
t is taking place. Its direction will depend on the direction ofthe lines of force threading the coil and on whether their numberis being increased or diminished. Its strength wih depend on therate at which their number is changing. If a mass of iron be brought within the field of a magnet, the… … FIG. 1—MORSE ELECTROMAGNETIC TELEGRAPH. about a pole of the magnet and the body of iron be moved to andfrom the pole, the intensity of the field in which the coil lies willvary, and currents of electricity will flow in the coil. In 1837 Professor Page of Salem, Mass., discovered that a rodof iron,…
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