Peaucellier Inversor
A Linkage with six rods which draws the inverse of a given curve. When a pencil is placed at 
, the inverse is drawnat 
(or vice versa). If a seventh rod (dashed) is added (with an additional pivot), is kept on a circle and the locustraced out by is a straight line. It therefore converts circular motion to linear motion without sliding, and wasdiscovered in 1864. Another Linkage which performs this feat using hinged squares had been published by Sarrus in 1853but ignored. Coxeter (1969, p. 428) shows that
See also Hart's Inversor, Linkage
References
Bogomolny, A. ``Peaucellier Linkage.'' http://www.cut-the-knot.com/pythagoras/invert.html. Courant, R. and Robbins, H. What is Mathematics?: An Elementary Approach to Ideas and Methods. Oxford, England: Oxford University Press, p. 156, 1978. Coxeter, H. S. M. Introduction to Geometry, 2nd ed. New York: Wiley, pp. 82-83, 1969. Ogilvy, C. S. Excursions in Geometry. New York: Dover, pp. 46-48, 1990. Rademacher, H. and Toeplitz, O. The Enjoyment of Mathematics: Selections from Mathematics for the Amateur. Princeton, NJ: Princeton University Press, pp. 121-126, 1957. Smith, D. E. A Source Book in Mathematics. New York: Dover, p. 324, 1994.
- Dirichlet Function
- Dirichlet Integrals
- Dirichlet Kernel
- Dirichlet Lambda Function
- Dirichlet L-Series
- Dirichlet Region
- Dirichlet's Boxing-In Principle
- Dirichlet's Box Principle
- Dirichlet Series
- Dirichlet's Formula
- Dirichlet's Lemma
- Dirichlet's Principle
- Dirichlet's Test
- Dirichlet's Theorem
- Dirichlet Structure Constant
- Dirichlet Tessellation
- Dirty Beam
- Dirty Map
- Disc
- Disconnected Form
- Disconnectivity
- Discontinuity
- Discontinuous
- Discordant Permutation
- Discrepancy Theorem