By Trevor I. Williams

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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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Electric arc welding of mild steel plates in shipbuilding has superseded riveting as the main form of structural attachment. The main advantages are a substantial saving in steel weight; economy of construction; greater fabrica­ tion potential; better continuity of strength; greater freedom of design; and -T ra n sp o rts, C 4 - S - A 1 (R ig h t -h a n d scale) -A irc ra ft carriers, S 4 - S 2 - B B 3 (L e ft-h a n d scale) - 5000 T ankers, T 2 (Left-h and scale) F ig. 10. A. This shows the reduction in manhours for building standard ships such as T2 tankers, Liberty ships, etc.

M ixed blessing, the motor in Britain. Leonard Hill, London (1958). C ornwell. E. L. Commercial road vehicles. \y , John. The Bosch book o f the motorcar. Collins, London (1975). no, G. N. 4 history o f sports cars. Nelson, London (1970). agl' The complete encyclopedia o f motorcars 18S3 to date. Anthont'. (1971)- Ebury Press, London (1973). Cassell, London Steam cars 1 770 to i<)70. N icholson, T . R. The vintage car, i g i q - i g j o . Batsford, London (1966). \m. The motorcar and politics, i8 g 6 - ig 7 0 .

For the first twenty years standards were main­ tained, but thereafter there was rapid and substantial progress. As was natural, the first iron and steel cargo ships of the latter years of the nineteenth century followed in many respects the design of the sailing ships which they superseded, and were mainly of the flush-deck type. These were gradually improved by the extension of the bridge structure amidships to the ship’s side; the raising of the quarterdeck to form a poop; and an increased height for the forecastle.

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