An Interesting Thermo-Electric Motor
The following brief description of a very
simple thermo-electric motor will make it
easy to build for the ordinary experimenter.
The rim of the wheel is made from
fairly thick iron wire and held by a cork
B. The spokes C, C1, C2, C3, are made of
copper wire. The wheel is supported by a
pin P and cork A. This cork is next glued
to the base. A large steel horseshoe magnet
is next supported on a block of wood
K, near the wheel as shown. A small alcohol
lamp is now placed under the rim of
As soon as that portion of the
wheel becomes hot the wheel will begin to
turn slowly, the heated portion turning
away from the magnet—the reason being
that, while iron is attracted by a magnet
at ordinary temperatures, when the temperature
is increased beyond a certain limit
this partially ceases to be the case.
the cooler part is still subject to magnetic
attraction, and the wheel is consequently
kept on turning so as to bring such cooled
portions in closer proximity to the poles
of the steel magnet. The rim of the wheel
should be not less than 3 to 4 inches in
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