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 601
The wheels were very light, and of the simplest con-struction. One is figured at B. Eight slender arms,of tV square iron, with their inner ends cast in the cen-tral piece, extended 20 inches from the centre, and thusmade a 40-inch wheel. To stiffen them, and trans-mit any strain upon one to the…
United States. Patent Office · Patents · Inventions · Aids to navigation
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