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1 Mallet, Jules Théodore Anatole
[br]b. 1837 Geneva, Switzerlandd. November 1919 Nice, France[br]Swiss engineer, inventor of the compound steam locomotive and the Mallet articulated locomotive.[br]Mallet's family moved to Normandy while he was still a child. After working as a civil engineer, in 1867 he turned to machinery, particularly to compound steam engines. He designed the first true compound steam locomotives, which were built for the Bayonne- Biarritz Railway in 1876. They were 0–4–2 tank locomotives with one high-pressure and one low-pressure cylinder. A starting valve controlled by the driver admitted high-pressure steam to the low-pressure cylinder while the high-pressure cylinder exhausted to the atmosphere. At that time it was thought impracticable in a narrow-gauge locomotive to have more than three coupled axles in rigid frames. Mallet patented his system of articulation in 1884 and the first locomotives were built to that design in 1888: they were 0–4–4–0 tanks with two sets of frames. The two rear pairs of wheels carried the rear set of frames and were driven by two high-pressure cylinders; the two front pairs, which were driven by the high-pressure cylinders, carried a separate set of frames that was allowed sideplay, with a centre of rotation between the low-pressure cylinders. In contrast to the patent locomotive of Robert Fairlie, no flexible connections were required to carry steam at boiler pressure. The first Mallet articulated locomotives were small, built to 60 cm (23.6 in.) gauge: the first standard-gauge Mallets were built in 1890, for the St Gotthard Railway, and it was only after the type was adopted by American railways in 1904 that large Mallet locomotives were built, with sizes increasing rapidly to culminate in some of the largest steam locomotives ever produced. In the late 1880s Mallet also designed monorail locomotives, which were built for the system developed by C.F.M.-T. Lartigue.[br]Bibliography1884, French patent no. 162,876 (articulated locomotive).Further ReadingJ.T.van Riemsdijk, 1970, "The compound locomotive, Part I", Transactions of the Newcomen Society 43 (describes Mallet's work on compounding).L.Wiener, 1930, Articulated Locomotives, London: Constable (describes his articulated locomotives).For the Mallet family, see Historisch-Biographisches Lexikon der Schweiz.PJGRBiographical history of technology > Mallet, Jules Théodore Anatole
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2 Bousquet, Gaston du
[br]b. 20 August 1839 Paris, Franced. 24 March 1910 Paris, France[br]French locomotive engineer noted for the successful development of compound locomotives.[br]Bousquet spent his entire working life with the Northern Railway of France, reaching the position of Chief Engineer of Rolling Stock and Motive Power in 1890. In 1886 he was associated with Alfred de Glehn, technical head of locomotive builder Société Alsacienne de Constructions Mécaniques, in the building of a four-cylinder, four-crank, compound 2–2–2–0 partly derived from the work of F.W. Webb. In continuing association with de Glehn, Bousquet then designed a four-cylinder, compound 440 with the low-pressure cylinders beneath the smokebox and the high-pressure ones outside the frames; the first was completed in 1891. The details were well designed and the locomotive was the forerunner of a highly successful series. It was developed into 4–6–0, 4–4–2 and 4–6–2 types, and examples were used in quantity by all the principal French railways and by some in Germany, while G.J. Churchward brought three of the 4–4–2s to the Great Western Railway in England for comparison with his own locomotives. In 1905 Bousquet introduced an articulated 0–6–2+2–6–0 compound tank locomotive for freight trains: the two driving bogies supported a frame carrying boiler, tanks, etc. At the time of his death he was working on compound 4–6–4 locomotives.[br]Further ReadingJ.T.van Riemsdijk, 1970, "The compound locomotive (Part 1)", Transactions of the New comen Society 43; 1972, Part 2, Transactions of the New comen Society 44 (fully describes Bousquet's locomotives).See also: Mallet, Jules Théodore AnatolePJGR -
3 Land transport
See also: INDEX BY SUBJECT AREA[br]Austin, HerbertHamilton, Harold LeeIssigonis, Sir Alexander Arnold ConstantineMa JunMorris, William RichardSauerbrun, Charles de -
4 Railways and locomotives
Biographical history of technology > Railways and locomotives
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5 Vauclain, Samuel Matthews
[br]b. 18 May 1856 Philadelphia, USAd. 4 February 1940 Rosemont, Pennsylvania, USA[br]American locomotive builder, inventor of the Vauclain compound system.[br]Vauclain entered the service of the Pennsylvania Railroad in 1872 as an apprentice in Altoona workshops and moved to the Baldwin Locomotive Works in 1883. He remained with the latter for fifty-seven years, becoming President in 1919 and Chairman of the Board in 1929.The first locomotive to his pattern of compound was built in 1889. There were four cylinders: on each side of the locomotive a high-pressure cylinder and a low-pressure cylinder were positioned one above the other, their pistons driving a common cross-head. They shared, also, a common piston valve. Large two-cylinder compound locomotives had been found to suffer from uneven distribution of power between the two sides of the locomotive: Vauclain's system overcame this problem while retaining the accessibility of a locomotive with two outside cylinders. It was used extensively in the USA and other parts of the world, but not in Britain. Among many other developments, in 1897 Vauclain was responsible for the construction of the first locomotives of the 2–8–2 wheel arrangement.[br]Bibliography1930, Steaming Up (autobiography).Further ReadingObituary, 1941, Transactions of the Newcomen Society 20:180.J.T.van Reimsdijk, 1970, The compound locomotive. Part 1:1876 to 1901', Transactions of the Newcomen Society 43:9 (describes Vauclain's system of compounding).PJGRBiographical history of technology > Vauclain, Samuel Matthews
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