Man's quest for free power
The first law of thermodynamics says, in effect, that you cannot get something for nothing—but that has never stopped people from trying. It is scientifically impossible to build a machine that will run without an external energy supply, yet for centuries inventors have persisted with designs for perpetual-motion machines.
One of the most common was a gravity-operated overbalancing wheel. If a weight is attached near the top of an upright wheel, the wheel will rotate until the weight reaches the bottom. If it were possible to arrange a series of weights around the wheel so that those on the way down were farther from the wheel's center
than those on the way up, the result would be an overbalancing wheel that would keep on turning.
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