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 608
sensibly, more powerto carry them round than any other tried, and were miserablydeficient in pushing the vessel forward with it—certainly notequalling four of the competing blades. They produced quitea commotion in the w^ater, carried large quantities over withthem, and, could we have communicated… … All THICKNESS or PADDLES. jire But though worthless in one respect, they -^s^riM^aluable in another, for theyled us to the fact, or the law, that the propellmgCvirtue of blades expands andcontracts with their thickness. Thicken them till they touch each other, andthey form a perfect drum, which…
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