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). House · Washington [D.C.] : Office of Printers to House of Reps. · leaf 601
de of the boat, whichprevented the wheels, that were secured on each extremity, from throwing asmuch w^ater i|to the vessel as if they had been nearer; and afforded a betteropportunity of observing the action of the blades. A person seated at one endof the boat, readily turned the wheels in either…
United States. Patent Office · Patents · Inventions · Aids to navigation
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