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The Pratt Wheel

The Pratt wheel is actually sets of two or more wheels mounted on two axles running parallel in which the circumference of each wheel is perpendicular and as close as possible to the adjacent parallel axle and which rotate in opposing directions. Each wheel has spherical weights which drop back and forth from wheel to wheel in such a manner that a weight on the circumference will drop off onto the adjacent wheel toward its center so that the adjacent wheel will lift it to the top of its inner circumference at which point it will roll by gravity to the outer circumference and use its weight to push the wheel downward to the point where the outer circumference of the wheel meets the inner circumference point on the adjacent original wheel where the spherical weight drops back onto the inner circumference of the original wheel.