Identifier: factoryindustria15newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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developed on an average 3,700 h. p.,giving a speed of 19^ knots. The remaining boat, the Speedy,built by Jno. I. Ihornycroft ik Co., is of peculiar interest from thefact that she was the first large boat in the navy fitted with water-tubeboilers. The sketch plan on this page shows the relative spaces takenby the locomotive and water-tube boilers. The large excess of powerobtained by the l)oilers in the Speedy undoubtedly led in a largemeasure to the working out of the present form of ** destroyer. The Speedy, of which a very good idea can be obtained irom theillustration on page 193, is 230 feet long, 27 feet beam, 8 feet 8inches draught, and 810 tons displacement. She was fitted with eightIhornycroft boilers, each having 25.5 scpiare feet of grate surface,and 1,840 S(niare feet of heating surface. On trial, 4,700 h. p.was easily developed, and with this a speed of 20J j knots was ob-tained. At a later date, in ordinary service, after the navy stokers TORPEDO-BOAT J)ES71<0YERS. 193
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H.M.S. SPEEDY—TORPEDO GlNBC^AT. 81O TONSjDlSPLACEMENT. 45OO I.H.P., FORCED DRAUGHT. 230x27x8^ ft. ; speed 20>^ knots. John I, Thornycroft &Xo. had become accustomed to the new type of boiler, there was no diffi-culty in developing 5,000 h. p. Thus an increase of 1,300 h. p. hadbeen accomplished, with a reduction of 20 tons in the weight of theboilers. The i. h. p. developed per ton of boiler averaged 43.9.Under natural draught, on a trial lasting 20 hours, the coal consumedwas only 1.58 pounds per i. h. p., which compares favorably with thebest marine practice. In further effort to obtain speed, boats of the Halcyon class,of 1,070 tons displacement, were built, but did not prove very suc-cessful. During all this time the speed of the ordinary torpedo boathad rapidly increased, but there had been no corresponding increasein the speed of the catchers. This led to the working out, in 1893,by Thornycroft and Yarrow, respectively, of the Daring and Havock,the first of the < des

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