Straight-line Mechanisms

A straight-line mechanism causes a point to travel in a straight line, or in a nearly straight line, without being guided by a plane surface. In each of the applets, drag the sliders to change the shape of the path of the free point to obtain the longest possible straight path.

Scott-Russell mechanism.

Scott-Russell variation #1.

Scott-Russell variation #2.

Watt's straight-line mechanism.

Robert's straight-line mechanism.