Each turn of the crank handle rotates all the Leibniz wheels by one full turn. The computing engine of an Arithmometer has a set of linked Leibniz wheels coupled to a crank handle. It is set to mesh with three teeth at each rotation and therefore would add or subtract 3 from the counter at each rotation. The animation on the side shows a nine-tooth Leibniz wheel coupled to a red counting wheel. By coupling a Leibniz wheel with a counting wheel free to move up and down its length, the counting wheel can mesh with any number of teeth.
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