By Trevor I. Williams

ISBN-10: 0198581556

ISBN-13: 9780198581550

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Additional resources for A History of Technology. Volume VII, The Twentieth Century, c. 1900 to c. 1950. Part II

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The introduction of steel boilers, associated with the triple-expansion engine, allowed working pressures to be raised to about 150 Ib/in- and although there was little external change in the appear­ ance of reciprocating engines in the inter-war period the triple-expansion engine reached its ultimate stage of development when the reheating system, which in various ways gave appreciable improvements in performance, was introduced. The steam turbine (Ch. 41) first came into prominence after its use in the Turbinia in 1897 and was in general use in warships by about 1910.

World. ); Nor­ mandie (French); and Arcadia (British) (Fig. 7). A notable difference between the passenger liners of the nineteenth and twentieth century was the absence of built-up superstructures in the earlier types. This was because the 1894 Merchant Shipping Act limited the number of passengers which could be carried on the upper deck. When, in 1906, this restriction was removed two and three tiers of superstructures were immedi­ ately fitted in new liners. This had the effect of increasing the beam in relation to the length and the increased space available to passengers also increased the relative depth of the ship.

Their Vespa had a 98 cc single-cylinder two-stroke engine driving through a three-speed gearbox and chain to the rear wheel, and a stressed-skin, spot-welded spine frame. Other Vespas with engines sizes up to 150 cc followed, and the design started a vogue which was taken up by numerous manufacturers in Italy, France, Germany, Great Britain, Spain, Austria, Czechoslovakia, and the Soviet Union. Another post-war development was a return to the cyclemotor, or motorized bicycle. U. ‘Quickly’ and Honda C50.

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A History of Technology. Volume VII, The Twentieth Century, c. 1900 to c. 1950. Part II by Trevor I. Williams

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