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Scientific American Supplement, No. 601, July 9, 1887 by Various
page 94 of 131 (71%)
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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