A linkage used in the original steam engine to turn back-and-forth motion into approximately straight-line motion.
Watt's Parallelogram
See also
Linkage, Watt's CurveExplore with Wolfram|Alpha
References
Rademacher, H. and Toeplitz, O. The Enjoyment of Mathematics: Selections from Mathematics for the Amateur. Princeton, NJ: Princeton University Press, pp. 119-121, 1957.Referenced on Wolfram|Alpha
Watt's ParallelogramCite this as:
Weisstein, Eric W. "Watt's Parallelogram." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WattsParallelogram.html