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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 129

An illustration from American telephone practice, 1905, leaf 129
FIG. 79-—DIAGRAM OF GENERATOR AND BELL. The two poles of the electromagnet will thus have a given polarity,say, north, while the two ends of the armature will have an oppositepolarity, south. As a result, the armature will have a tendency to … FIGS. AND 81.—DETAILS OF TYPICAL MAGNETO GENERATOR. stick to one pole or the other of the magnets. The two coils areoppositely wound, and when a current passes through them itstrengthens the magnetism of one pole and weakens that of theother. The next instant the current reverses, and the strong…

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