2012, ISBN: 1231465786

[EAN: 9781231465783], Neubuch, [PU: Rarebooksclub.com, United States], Brand New Book ***** Print on Demand *****.This historic book may have numerous typos and missing text. Purchasers c… Plus…

[EAN: 9781231465783], Neubuch, [PU: Rarebooksclub.com, United States], Brand New Book ***** Print on Demand *****.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1857 Excerpt: . of the wheel. Their surfaces may be plain, convex, or concave. 2. A screw propeller. "It consists of two or more curvilineil "leaves or plyers formed as follows, and attached to an axis. The "curves of which the leaves or plyers should be formed are obtained "by the descent of a tracer down the surface of a cone or conoid "caused to revolve on its axis. Curves so obtained have a con"stantly varying inclination with their axis." A form of cone is preferred "such that its abscissas shall increase or diminish in "arithmetical progression, while its ordinates increase or diminish "in geometrical progression." Printed, 5d. Drawings. See Repertory of Arts, vol. 14 (new series), p. 2 1; Inventors' Advocate, vol. 2, p. 355; Engineers and Architects' Journ il, vol. 12, p. 259. In A.D. 1839 a Patent was granted to B. D. Beecher in America for employing two screws set in the cut-water (a). A.D. 1840, February 8.--N 83/7. TAYLER, Joseph Needham.--1. Inside the paddle-box is fitted a ' shield' or part of a strong cylinder clear of the floats, and borne on the paddle-shaft by arms not fixed to the shaft. The shield may be lowered by cog-wheels and chains so as to cover one wheel when the other is moving, or to protect both wheels when the vessel is at anchor or it may be lowered astern of them when she is scudding. 2. A chain on the paddle-shaft is led to wheels which turn the capstan or windlass. The paddle-wheels may be disconnected by throwing out of gear a strong clutch which allows the shaft to work the windlass and not the wheels. Printed, 9d. Drawings. See London Journal (Newton's), vol. 21 (conjoined series), p. 347; Inventors' Advoc.ite, vol. 3, p. 114. (a) Bourne on the Screw Propeller, London, IS55, .<

ISBN: 9781231465783

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