Peaucellier's and Hart's Inversor
The Demonstration provides two linkages to convert circular motion to linear motion.[more]
Peaucellier's mechanism was discovered in 1864. It has seven rods and converts circular motion of the point to linear motion of the point .
Hart's linkage was discovered in 1875. It is a five-link mechanism that converts circular motion of to linear motion of .[less]
E. D. Demaine and J. O'Rurke, Geometric Folding Algorithms, New York: Cambridge University Press, 2007 pp. 30–42