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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
used. Since that time the tendency has been to reduce the length of the spiral. We find notices of the suggested or experimental use of the screw-propeller by Hooke, 1680; Duquet, 1727; Pancton, 1768; Watt, 1780; Seguin, 1792; Fulton, 1794; Cartwright, 1798; Shorter, 1802. The idea of propelling vessels by a screw in lieu of oars is mentioned in the Machines et Inventions approuvees par l'academie Royale des Sciences depuis 1727 jusqu à 1731. Franklin suggested the same thing. Lyttleton's English patent, in 1794, for an aquatic propeller consisted of a screw of one, two, or more threads wrapped around a cylinder, and revolving in a frame placed at the head, stern, or side of a vessel. The credit of the first application of the screwpro-peller for marine propulsion is undoubtedly due to Colonel John Stevens, of Hoboken, N. J. In 1804, he constructed a boat with twin screws, which attained a very considerable speed. The machinery of this boat (a, Fig. 4747), which was 5