The lengths of the links comply with the condition: A͞B=B͞C=B͞F. Point F of connecting rod 2 travels along axis Ay. Points D and E of connecting rod 2 describe ellipses with the equations (x²/F͞D²)+(y²/C͞D²)=1 and (x²/F͞E²)+(y²/C͞E²)=1. The other points of connecting rod 2 also describe ellipses which are variously oriented with respect to axes Ax and Ay. Points lying on a circle of a diameter equal to C͞F describe straight lines passing through point A and, finally, point B describes a circle.
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