Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1903)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 324
evolution of the coil there are thus two alternations of cur-rent, and two points of maximum E. M. F., at 90° and270°, and two points of zero E. M. F.—that is, when thecurrent changes its direction at 0° and 180°. When this loopis mounted on a shaft and so rotated, we have the principle ofa simple…
Electricity · Magnetism
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