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 621
roduce a tridental posterior margin, and a generaloutline akin to that of the sea-bass, figured also on the page referred to, ex-hibiting moreover, a striking likeness to the paddles of swimming and diving-birds. In sea-leopards, sea-bears, lions and kindred animals, each foot be-comes lobed,… … Porpoise and Seal. As the movements of seals consist more in diving than in long lateral jour-nies, the blade is transverse. So it is with whales, which have it lobated.Breathing air, they cannot remain long under the smface without sufFocationyhence it is essential that they should have the power…
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