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The ''Experiment'' was an early nineteenth century boat powered by horses and incorporated the then novel idea of a screw propeller. ==History== The ''Experiment'' was a horse-powered ferry boat. It was a twelve-ton three-mast boat drawing a few feet of water, about 100 feet long by 20 feet beam. Its driving mechanism, an in-water screw, was invented by David Grieve in 1801. The boat was constructed by David Wilkinson (some sources give his name as ''Varnum'') in 1807 to 1810, depending on the source.〔 p. 31 ''Mr. Varnum Wilkinson, now living (1859), built " The Experiment," he thinks in 1809 or 1810. ''〕 It was propelled by a "goose-foot paddle" large mechanical screw propeller in the water (instead of a paddle wheel at water surface).〔 The new technology devised by Grieve and Wilkinson was powered by eight horses on a treadmill. The horse boat technology to propel the boat upstream was originally invented by David Grieve and granted a patent February 24, 1801 in the patent category of "Boats to ascend rivers". The complete recorded patent was lost in the 1836 U.S. Patent Office fire.〔 The novel idea of propelling vessels upstream by the use of a large mechanical screw in the water is now referred to as Ericsson’s propeller.〔 It is reported that the ''Experiment'' made one unsuccessful voyage, as it ran aground on the return trip. The mechanism and associated parts were put together by Ephraim Southworth. Little thought was put into planning the construction, and it was poorly built.〔(Field, p. 511-512 )〕 The maiden test voyage was in June 1809 of a group of gentlemen from the Grand Lodge of the State.〔(Rhode Island Society, p. 30 )〕 The first attempt of the "Screw Boat" began at Jackson's Wharf on Eddy's Point near Providence, Rhode Island, with a destination of Pawtuxet Village.〔 The eight horses for the "horse power", owned by Marvin Morris, were connected mechanically to a poorly designed contraption to make the boat move. It obtained a top speed of four knots with the help of a tide going in her direction and the wind on her back. It managed to get to Pawtuxet Village where there was much celebration over its success. The return trip, however, resulted in humiliation when a gust of wind drove the ''Experiment'' onto mud flats, causing its demise.〔Hazard, p. 294〕 The ''Experiment'' venture had sold shares of stock from a prospectus to raise money to build it.〔 There was so much confidence in the venture that tickets were engraved by William Hamlin for its anticipated voyages to ''New-Port'' and Providence. Ultimately, the horse boat and all the associated items were seized by the Sheriff at the behest of Grieve's creditors (or investors) and sold for lack of payments on the loans, since it was not a successful venture.〔 Alternatively, Wilkinson later said that "after the frolic" it was "hauled up" and allowed to go to waste and ruin.〔 Nevertheless, the ship was carefully studied by Daniel French, who did the drawings for Robert Fulton's ''North River Steamboat'' (known as ''Clermont''), and may have benefited that enterprise.〔 The ''Experiment'' is important as a precursor of public transport on rivers, and it was the forerunner of a number of horse powered boats, chiefly ferries, used for more than a half century along the eastern seaboard of the United States. Most commonly, those were paddle wheel boats, not screw type propellers. Inclined treadmills were often used.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Experiment (horse-powered boat)」の詳細全文を読む スポンサード リンク
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