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Among hundreds of men wearing turbans and topees at Karachi’s main train station, Muhammad Arshad stood out in his blue baseball cap with Rotary’s bright yellow gearwheel.

The continual restlessness of his great mind can be seen in the numerous sheets on which he had sketched, say, a gearwheel mechanism, only to move swiftly on to a series of male nudes or a study of ocean waves without even changing paper.

As the optional link JK held the gearwheel centers always equidistant, the annular guide G was not used.

First take the case of a small gearwheel, say 1 in. outside diameter and 1/16 in. thick, with twenty-four teeth.