The lengths of the links comply with the condition: A͞C=B͞C=C͞D. When link 2 moves along the fixed guides its point B travels along straight line Ab. Point D of link 3 travels along straight line Aa. Lines Ab and Aa are perpendicular to each other. The motion of link 3 can also be produced by the rolling of circle d, rigidly secured to link 3, without slipping around fixed circle e, the radii of the circles being in the proportion A͞C:B͞D. If slider 2 is the driving link, link 1 oscillates about fixed axis A.
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