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). House · Washington [D.C.] : Office of Printers to House of Reps. · 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 OF PADDLES. But though w^orthless in one respect, they were valuable in another, for theyled Hs to the fact, or the law, that the propelling virtue of blades expands andcontracts with their thickness. Thicken them till they touch each other, andthey form a perfect drum, w^hich could…
United States. Patent Office · Patents · Inventions · Aids to navigation
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