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
[15] 5S8 … The same blades were next tried as fig. 6. From the ex-periment fig. 5, it was inferable that, if inverted, the effect ofthe blade on the boat would be augmented, as a larger portionwould have a longer sweep through the water. Such was thefact, and to such a degree that first two, and then four,…
United States. Patent Office · Patents · Inventions · Aids to navigation
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