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1 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 -
2 Land transport
See also: INDEX BY SUBJECT AREA[br]Austin, HerbertHamilton, Harold LeeIssigonis, Sir Alexander Arnold ConstantineMa JunMorris, William RichardSauerbrun, Charles de -
3 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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4 Railways and locomotives
Biographical history of technology > Railways and locomotives
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5 Webb, Francis William
[br]b. 21 May 1836 Tixall, Staffordshire, Englandd. 4 June 1906 Bournemouth, England[br]English locomotive engineer who pioneered compound locomotives in Britain and the use of steel for boilers.[br]Webb was a pupil at Crewe Works, London \& North Western Railway (LNWR), under F. Trevithick (son of Richard Trevithick), and was subsequently placed in charge of the works under Trevithick's successor, J.Ramsbottom. After a brief spell away from the LNWR, Webb returned in 1871 and was made Chief Mechanical Engineer, a post he held until his retirement in 1904.Webb's initial designs included the highly successful "Precedent" or "Jumbo" class 2– 4–0, from which the example Hardwicke (now preserved by the National Railway Museum, York) achieved an average speed of 67.2 mph (108.1 km/h) between Crewe and Carlisle in 1895. His 0–6–0 "coal engines" were straightforward and cheap and were built in large numbers. In 1879 Webb, having noted the introduction of compound locomotives in France by J.T.A. Mallet, rebuilt an existing 2–2–2 locomotive as a two-cylinder compound. Then in 1882, seeking fuel economy and the suppression of coupling rods, he produced a compound locomotive to his own design, the 2–2, 2–0 Experiment, in which two outside high-pressure cylinders drove the rear driving-wheels, and a single inside large-diameter low-pressure cylinder drove the front driving-wheels. This was followed by a large number of compound locomotives: three successive classes of 2–2, 2–0s; some 2–2, 2–2s; some 4–4–0s; and some 0–8–0s for goods traffic. Although these were capable of good performance, their overall value was controversial: Webb, who was notoriously autocratic, may never have been fully informed of their defects, and after his retirement most were quickly scrapped. Webb made many other innovations during his career, one of the most important being the construction of boilers from steel rather than wrought iron.[br]Further ReadingC.Hamilton Ellis, 1958, Twenty Locomotive Men, Shepperton: Ian Allan, Ch. 14 (describes Webb's career).E.L.Ahrons, 1927, The British Steam Railway Locomotive 2825–1925, London: The Locomotive Publishing Co., Chs 18 and 20 (includes a critique of Webb's compound locomotives).PJGR -
6 Brotan, Johann
SUBJECT AREA: Railways and locomotives[br]b. 24 June 1843 Kattau, Bohemia (now in the Czech Republic)d. 20 November 1923 Vienna, Austria[br]Czech engineer, pioneer of the watertube firebox for steam locomotive boilers.[br]Brotan, who was Chief Engineer of the main workshops of the Royal Austrian State Railways at Gmund, found that locomotive inner fireboxes of the usual type were both expensive, because the copper from which they were made had to be imported, and short-lived, because of corrosion resulting from the use of coal with high sulphur content. He designed a firebox of which the side and rear walls comprised rows of vertical watertubes, expanded at their lower ends into a tubular foundation ring and at the top into a longitudinal water/steam drum. This projected forward above the boiler barrel (which was of the usual firetube type, though of small diameter), to which it was connected. Copper plates were eliminated, as were firebox stays.The first boiler to incorporate a Brotan firebox was built at Gmund under the inventor's supervision and replaced the earlier boiler of a 0−6−0 in 1901. The increased radiantly heated surface was found to produce a boiler with very good steaming qualities, while the working pressure too could be increased, with consequent fuel economies. Further locomotives in Austria and, experimentally, elsewhere were equipped with Brotan boilers.Disadvantages of the boiler were the necessity of keeping the tubes clear of scale, and a degree of structural weakness. The Swiss engineer E. Deffner improved the latter aspect by eliminating the forward extension of the water/steam drum, replacing it with a large-diameter boiler barrel with the rear section of tapered wagon-top type so that the front of the water/steam drum could be joined directly to the rear tubeplate. The first locomotives to be fitted with this Brotan-Deffner boiler were two 4−6−0s for the Swiss Federal Railways in 1908 and showed very favourable results. However, steam locomotive development ceased in Switzerland a few years later in favour of electrification, but boilers of the Brotan-Deffner type and further developments of it were used in many other European countries, notably Hungary, where more than 1,000 were built. They were also used experimentally in the USA: for instance, Samuel Vauclain, as President of Baldwin Locomotive Works, sent his senior design engineer to study Hungarian experience and then had a high-powered 4−8−0 built with a watertube firebox. On stationary test this produced the very high figure of 4,515 ihp (3,370 kW), but further development work was frustrated by the trade depression commencing in 1929. In France, Gaston du Bousquet had obtained good results from experimental installations of Brotan-Deffner-type boilers, and incorporated one into one of his high-powered 4−6−4s of 1910. Experiments were terminated suddenly by his death, followed by the First World War, but thirty-five years later André Chapelon proposed using a watertube firebox to obtain the high pressure needed for a triple-expansion, high-powered, steam locomotive, development of which was overtaken by electrification.[br]Further ReadingG.Szontagh, 1991, "Brotan and Brotan-Deffner type fireboxes and boilers applied to steam locomotives", Transactions of the Newcomen Society 62 (an authoritative account of Brotan boilers).PJGR
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