Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 324
revolution 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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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-246-24.webp)
