Peaucellier linkage, Watt's linkage, straight line motion, steam engine

Description:

The Reuleaux kinematic model collection at Cornell University has many linkages; the most popular of these among mathematicians is the Peaucellier-Lipkin linkage. This article is a short introduction (not complete) on the history of the problem of how to change circular motion into straight-line motion and vice versa. Some mathematicians formulated this problem as - how to draw a straight line?