British instrument maker and engineer (1736-1819) who developed an efficient steam engine which was a universal source of power and provided one of the most essential technological components of the early industrial revolution. The watt, a unit of power, was named after him, and he also defined horsepower. ALS, one page, 4.5 x 7, October 25. Letter to an unidentified gentleman. In part, “This serves to introduce Mr. Biot of the National Institute of France, whose fame as a natural philosopher has probably reached you. Your civilities to him will much oblige me. Mrs. W. joins in complts.” Light overall staining working in from all four edges, otherwise fine condition. COA John Reznikoff/PSA/DNA and R&R COA.
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