Model: S26 Inversion of the Lemniscate Straight-Line Linkage
This straight-line mechanism is a variation of the linkage of James Watt that he used in his steam engine designs circa 1780. (See abstract for model S-24.) This special case of the four-bar linkage has been shown to trace a curve similar to the mathematical lemniscate. The flat section of the coupler curve traced by this linkage is only approximately a straight-line. An exact straight-line linkage was discovered by the French engineer Peaucellier and the Russian mathematician Lipkin around 1870. (See abstract for model S-35 as well as the tutorial on the Peaucellier mechanism. "How to Draw a Straight Line')

Francis Moon 2004-07-00

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