An 1892 bipolar Edison fan.
What an artifact! The fan is not powered by the mains, but by direct current. And the current is obtained in a system of several inductor coils with a closed magnetic core. The fan screw is supposed to rotate EVERYTHING, and the regulation is set with a golden lever. A neat design, just brilliant!
The very fact of existence of such mechanisms, a little more than a century ago, is just a mockery at the stupidity of modern akademics.
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