Watt's Linkage - Steam-Engine Straight-Line Motion Desk Kit

James Watt needed the top of his steam-engine piston rod to move straight while the beam above it swung in an arc. In 1784 he patented this answer: two opposed rockers joined by a short link. The midpoint of that link draws a long figure-eight whose middle is nearly a perfect straight line, and Watt called it the invention he was proudest of. Slide the red knob and watch it follow the path groove cut into the walnut-style base, over an engraved 10 mm graph grid. Raised brass-style name plaque,…

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