A linkage which draws the inverse of a given curve. It can also convert circular to linear motion. The rods satisfy
and , and , , and remain Collinear. Coxeter (1969, p. 428) shows that if ,
then

**References**

Courant, R. and Robbins, H. *What is Mathematics?: An Elementary Approach to Ideas and Methods.*
Oxford, England: Oxford University Press, p. 157, 1978.

Coxeter, H. S. M. *Introduction to Geometry, 2nd ed.* New York: Wiley, pp. 82-83, 1969.

Rademacher, H. and Toeplitz, O. *The Enjoyment of Mathematics: Selections from Mathematics for the Amateur.*
Princeton, NJ: Princeton University Press, pp. 124-129, 1957.

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1999-05-25