Peaucelliern.
/ˌpəʊˈsɛlɪə/, /ˌpəʊˈsɛlɪeɪ/, U.S. /poʊˈsɛliər/, /ˌpoʊsɛlˈjeɪ/ Mechanics.
attributive and in the genitive. Designating a linkage consisting of a jointed rhombus of which two opposite vertices are linked to a fixed point by bars of equal length, resulting in the property that when one of the other two vertices is moved to trace out a curve, the other traces out the inverse curve.
ΚΠ
1874 Notices Proc. Royal Inst. Great Brit. 7 188 We may, mounting with a suitable radius a pair of Peaucellier cells duly adjusted, cause a point to move in a parabola, ellipse, or hyperbola.
1875 A. Cayley Coll. Math. Papers IX. 317 The assumed transformation..can be effected immediately by a Peaucellier cell.
1930 F. D. Jones Ingenious Mechanisms I. 395 (caption) Arrangement of Peaucellier linkage for straight-line motion.
1982 Math. Rep. Acad. Sci. Canad. 4 87 We use a Peaucellier inverting linkage as the key to a new proof that certain oblique sections of a torus are circles.
1991 D. Wells Penguin Dict. Curious & Interesting Geom. 120 Peaucellier's cell can be used to invert a curve.
This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).
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n.1874