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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 the wheel.

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.

But 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 diameter.



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