When one of the conductors, as B, Fig. 10, composed of a disk, or,
better, of a pile of thin copper disks, or of a closed coil of wire, is
mounted on an axis, X, transverse to the axis of coil, C, through which
coil the alternating current passes, a deflection of B to the position
indicated by dotted lines will take place, unless the plane of B is at
the start exactly coincident with that of C. If slightly inclined at the
start, deflection will be caused as stated. It matters not whether the
coil, C, incloses the part, B, or be inclosed by it, or whether the
coil, C, be pivoted and B fixed, or both be pivoted. In Fig. 11 the
coil, C, surrounds an iron wire core, and B is pivoted above it, as
shown. It is deflected, as before, to the position indicated in dotted
lines.

[Illustration: FIG. 13]

It is important to remark here that in cases where deflection is to be
obtained, as in Figs. 10 and 11, B had best be made of a pile of thin
washers or a closed coil of insulated wire instead of a solid ring. This
avoids the lessening of effect which would come from the induction of
currents in the ring, B, in other directions than parallel to its
circumference.

[Illustration: FIG. 14.]

We will now turn our attention to the explanation of the actions
exhibited, and afterward refer to their possible applications. It may be
stated as certainly true that were the induced currents in the closed
conductor unaffected by any self-induction, the only phenomena exhibited
would be alternate equal attractions and repulsions, because currents
would be induced in opposite directions to that of the primary current