Daniel French was born in Berlin, Connecticut in 1770. From an early age French strove to become a "mechanician," an artisan trained in the theory of mechanics and skilled in the working of metals at increasing levels of precision. His friend Oliver Evans, an accomplished engineer, described French as an "original and ingenious inventor." French's most significant invention was the horizontally mounted, high-pressure, non-condensing, directly connected steam engine for mills, boats, etc. French was awarded a patent for his steam engine in 1809. This type of engine became standard on the western steamboat.
Daniel died in 1853.
Sources
"United States Census, 1850," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MHVV-ZZ1 : 12 April 2016), Daniel French in household of French, Jeffersonville, Clark, Indiana, United States; citing family 274, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).