Quotation from: General Science

Written by: Bertha M. Clark


If a wheel is attached to the rotating shaft, weights can be lifted,
and if a belt is attached to the wheel, the motion of the rotating
helix can be transferred to machinery for practical use.


The rotating coil is usually spoken of as the armature, and the large
magnet as the field magnet.


310. Mechanical Reversal of the Current. _The Commutator_. It is not
possible by hand to reverse the current with sufficient rapidity and
precision to insure uninterrupted rotation; moreover, the physical
exertion of such frequent reversals is considerable. Hence, some
mechanical device for periodically reversing the current is necessary,
if the motor is to be of commercial value.

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