Sliders 2 and 3 rotate about fixed axes A and B. The angle between the axes of the slots of link 1 equals 90° . Point E of slotted link 1 describes a circle. Any other point of link 1, for instance point F, located on circle b of radius A͞B, describes cardioid c. The motion of link 1 is identical to the rolling of movable circle b wi thout slipping around fixed circle a.
$936$LG,4L$