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You searched for: “inventions; perpetual-motion machine”
Results 1-3 of 3 sorted by date (ascending)
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1Thomas Jefferson to Thomas Bruff, 7 June 1812 (Jefferson Papers)
inventions; perpetual-motion machine [index entry] 
2Enclosure: Drawing of Charles Redheffer’s Perpetual-Motion Machine, [ca. 30 November 1812] (Jefferson Papers)
inventions; perpetual-motion machine [index entry] 
3Thomas Jefferson to Robert Patterson, 27 December 1812 (Jefferson Papers)
inventions; perpetual-motion machine [index entry]