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
ly against volumes of water whosereaction would not further the progress of the fish. Were such organs rec-tangular and inflexible boards, this would at once be obvious; it v^ould thenbe seen that the parts toward the body, instead of assisting, would be posi-tive hinderances. What such boards… … vanishes ; but with such, high speed cannot be atained for want of sweep,while with Jong and broad ones it is realized only with asurplus expenditure of vital force. A most beautifulcompromise between the two has therefore been devised,viz : caudate lohes^ in which the central and…
United States. Patent Office · Patents · Inventions · Aids to navigation
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