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 604
utet® be detected, except in perfectly still water. Fig. 14, a right-angled triangle, 7 inches across the top, and ending in apoint nearly 14 inches below it. These were, as might have been anticipated,more effective than those of fig. 3. Everything about them, observed Mr.B., shows their…
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