Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 324
olution of the coil then- arc thus two alternations of cur-rent, and two points of maximum E« M. F., at 9o° and270°, arid two points of zero K. M. F.—that is, when thecurrent changes its direction .-it 0° and 180°. When this loopis mounted on a shaft and so rotated, we have the principle »fa simple…
Electricity · Magnetism
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