Scientific American Supplement, No. 601, July 9, 1887 by Various
page 94 of 131 (71%)
page 94 of 131 (71%)
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while true, is not the whole truth, and just here we may supplement it
by the following statements: _An alternating current circuit or coil repels and attracts a closed circuit or coil placed in direct or magnetic inductive relation therewith; but the repulsive effect is in excess of the attractive effect. When the closed circuit or coil is so placed, and is of such low resistance metal that a comparatively large current can circulate as an induced current, so as to be subject to a large self-induction, the repulsive far exceeds the attractive effort_. For want of a better name, I shall call this excess of repulsive effect the "electro-inductive repulsion" of the coils or circuits. [Illustration: FIG. 6.] This preponderating repulsive effect may be utilized or may show its presence by producing movement or pressure in a given direction, by producing angular deflection as of a pivoted body, or by producing continuous rotation with a properly organized structure. Some of the simple devices realizing the conditions I will now describe. [Illustration: FIG. 7.] In Fig. 2, C is a coil traversed by alternating currents. B is a copper case or tube surrounding it, but not exactly over its center. The copper tube, B, is fairly massive and is the seat of heavy induced currents. There is a preponderance of repulsive action, tending to force the two |
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