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 618
rage upwards and consequently to whoma maximum of velocity in that direction is indispensable,the inferior one extends beyond its fellow. Furthermore,the degree of inequality is proportioned to the anglesformed by the lines of ascent and descent with the ho-rizon. In this very remarkable provision… … [15] 614 the more rapid the flight the longer and narrower, within certain hounds,must be the blades of propulsioL. This inequality in motive organs is believed to be unique: nothing like itoccurs in other departments of nature. Both wings of a bird or of an insectare uniform—identical in contour…
United States. Patent Office · Patents · Inventions · Aids to navigation
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