A Novel Monocoil Motor
There has recently been produced a miniature battery motor which can be
built for probably less money than any other motor ever designed,
considering the power of it. This motor is shown in the accompanying
illustration. But one electromagnet is used in its operation and one dry
cell will operate this motor at high speed.
The current through the electromagnet is made and broken as the armature
rotates by means of a circuit-breaker mounted on the shaft, against which
a spring brush bears. The principle is well known in dynamo-electric
phenomena, but very few motors have ever been built of this type.
The motor consumes only .4 of an ampere when operated on a single dry
cell. The comparatively heavy armature acts as a flywheel, thus causing
the machine to develop a surprising amount of power, considering its
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