Watt linkages and quadrilaterals
@article{Keady2004WattLA,
title={Watt linkages and quadrilaterals},
author={Grant Keady and Pj Scales and P. N{\'e}meth},
journal={The Mathematical Gazette},
year={2004},
volume={88},
pages={475 - 492}
}We define a Watt quadrilateral to be a quadrilateral with a pair of opposite sides of equal length. See Figure 1. 2. Linkages The Watt linkage (Figure 2) has equal-length cranks AD and BC, A and B fixed, and coupler bar CD. It was devised by James Watt about 1784 to constrain the steam-engine piston rod, connected at E, the midpoint of CD, to approximate straight-line motion over a limited range.
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