Report of the Commissioner of Patents, for the year 1849 (1850)
United States. Patent Office, Ewbank, Thomas, 1792-1870, Lincoln, Abraham, 1809-1865. Improved method of lifting vessels over shoals, United States. Congress (31st, 1st session : 1849-1850). Senate · Washington [D.C.] : Office of Printers to the Senate · leaf 603
r extent of their extremities, was probably true. The next form tried was fig. 3 placed in the position of fig. 8. Theseturned the boat round against the test ones, in circles varying from 50 to 200feet. We then tried six of them against the other eight, when there was littleobservable difference…
United States. Patent Office · Patents · Inventions · Aids to navigation
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