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61 Renold, Hans
SUBJECT AREA: Mechanical, pneumatic and hydraulic engineering[br]b. 31 July 1852 Aarau, Switzerlandd. 2 May 1943 Grange-over-Sands, Lancashire, England[br]Swiss (naturalized British 1881) mechanical engineer, inventor and pioneer of the precision chain industry.[br]Hans Renold was educated at the cantonal school of his native town and at the Polytechnic in Zurich. He worked in two or three small workshops during the polytechnic vacations and served an apprenticeship of eighteen months in an engineering works at Neuchâtel, Switzerland. After a short period of military service he found employment as a draughtsman in an engineering firm at Saint-Denis, near Paris, from 1871 to 1873. In 1873 Renold moved first to London and then to Manchester as a draughtsman and inspector with a firm of machinery exporters. From 1877 to 1879 he was a partner in his own firm of machine exporters. In 1879 he purchased a small firm in Salford making chain for the textile industry. At about this time J.K.Starley introduced the "safety" bicycle, which, however, lacked a satisfactory drive chain. Renold met this need with the invention of the bush roller chain, which he patented in 1880. The new chain formed the basis of the precision chain industry: the business expanded and new premises were acquired in Brook Street, Manchester, in 1881. In the same year Renold became a naturalized British subject.Continued expansion of the business necessitated the opening of a new factory in Brook Street in 1889. The factory was extended in 1895, but by 1906 more accommodation was needed and a site of 11 ½ acres was acquired in the Manchester suburb of Burnage: the move to the new building was finally completed in 1914. Over the years, further developments in the techniques of chain manufacture were made, including the invention in 1895 of the inverted tooth or silent chain. Renold made his first visit to America in 1891 to study machine-tool developments and designed for his own works special machine tools, including centreless grinding machines for dealing with wire rods up to 10 ft (3 m) in length.The business was established as a private limited company in 1903 and merged with the Coventry Chain Company Ltd in 1930. Good industrial relations were always of concern to Renold and he established a 48-hour week as early as 1896, in which year a works canteen was opened. Joint consultation with shop stewards date2 from 1917. Renold was elected a Member of the Institution of Mechanical Engineers in 1902 and in 1917 he was made a magistrate of the City of Manchester.[br]Principal Honours and DistinctionsHonorary DSc University of Manchester 1940.Further ReadingBasil H.Tripp, 1956, Renold Chains: A History of the Company and the Rise of the Precision Chain Industry 1879–1955, London.J.J.Guest, 1915, Grinding Machinery, London, pp. 289, 380 (describes grinding machines developed by Renold).RTS -
62 Reynolds, Osborne
SUBJECT AREA: Mechanical, pneumatic and hydraulic engineering[br]b. 23 April 1842 Belfast, Irelandd. 1912 Watchet, Somerset, England[br]English engineer and educator.[br]Osborne Reynolds's father, a clergyman and schoolteacher, had been a Fellow of Queens' College, Cambridge; it was to Queens' that the young Reynolds went to study mathematics, graduating as 7th Wrangler in 1867, and going on in his turn to become a Fellow of the College. Reynolds had developed an interest in practical applications of physics and engineering, and for a short time he entered the office of the London civil engineers Lawson and Mansergh. In 1868 he was appointed to the new Chair of Engineering at Owens College, Manchester, and he remained in this post for thirty-seven years, until he retired in 1905. During this period he presided over a department that grew steadily in size and reputation, and undertook prolonged research projects into phenomena such as lubrication, the laws governing the flow of water in pipes, turbulence and other physical features with practical applications. He was elected a Fellow of the Royal Society in 1877, being nominated Royal Medallist in 1888. In 1883 he became a Member of the Institution of Civil Engineers, and in 1885 he was awarded the Telford Premium of the Institution. He served as Secretary of the Manchester Literary and Philosophical Society from 1874 to 1883, and was appointed President in 1888–9 and Dalton Medallist in 1903. He was President of Section G of the British Association for the History of Science in 1887, and in 1884 he received the degree of LLD from Glasgow University. Among his many students at Owens College was J.J. (later Sir Joseph) Thomson (1856–1940), who entered the college in 1871. Reynolds's collected scientific papers were published in 1900–3.[br]Principal Honours and DistinctionsFRS 1877. Institution of Civil Engineers Telford Premium 1885. President, Manchester Literary and Philosophical Society 1888–9. Manchester Literary and Philosophical Society, Dalton Medal 1903.Further ReadingDictionary of National Biography Supplement.D.M.McDowell and J.D.Jackson (eds), 1970, Osborne Reynolds and Engineering Science Today, Manchester: Manchester University Press.AB -
63 Whittle, Sir Frank
SUBJECT AREA: Aerospace[br]b. 1 June 1907 Coventry, England[br]English engineer who developed the first British jet engine.[br]Frank Whittle enlisted in the Royal Air Force (RAF) as an apprentice, and after qualifying as a pilot he developed an interest in the technical aspects of aircraft propulsion. He was convinced that the gas-turbine engine could be adapted for use in aircraft, but he could not convince the Air Ministry, who turned down the proposal. Nevertheless, Whittle applied for a patent for his turbojet engine the following year, 1930. While still in the RAF, he was allowed time to study for a degree at Cambridge University and carry out postgraduate research (1934–7). By 1936 the official attitude had changed, and a company called Power Jets Ltd was set up to develop Whittle's jet engine. On 12 April 1937 the experimental engine was bench-tested. After further development, an official order was placed in March 1938. Whittle's engine had a centrifugal compressor, ten combustion chambers and a turbine to drive the compressor; all the power output came from the jet of hot gases.In 1939 an experimental aircraft was ordered from the Gloster Aircraft Company, the E 28/39, to house the Whittle W1 engine, and this made its first flight on 15 May 1941. A development of the W1 by Rolls-Royce, the Welland, was used to power the twin-engined Gloster Meteor fighter, which saw service with the RAF in 1944. Whittle retired from the RAF in 1948 and became a consultant. From 1977 he lived in the United States. Comparisons between the work of Whittle and Hans von Ohain show that each of the two engineers developed his engine without knowledge of the other's work. Whittle was the first to take out a patent, Ohain achieved the first flight; the Whittle engine and its derivatives, however, played a much greater role in the history of the jet engine.[br]Principal Honours and DistinctionsKnighted 1948. Commander of the Order of the Bath 1947. Order of Merit 1986. FRS 1947. Honorary Fellow of the Royal Aeronautical Society.Bibliography1953, Jet, London (an account not only of his technical problems, but also of the difficulties with civil servants, politicians and commercial organizations).Further ReadingJ.Golley, 1987, Whittle: The True Story, Shrewsbury (this author based his work on Jet, but carried out research, aided by Whittle, to give a fuller account with the benefit of hindsight).JDS -
64 Zuse, Konrad
SUBJECT AREA: Electronics and information technology[br]b. 22 June 1910 Berlin, Germany[br]German civil engineer who developed a series of computers before, during and after the Second World War.[br]Zuse grew up in Braunsberg, then in East Prussia, and attended the Technische Hochschule at Berlin-Charlottenburg to study civil engineering. In 1934 he became interested in calculatingmachines and the pursuit of a career in aeronautical engineering. Two years later, having taken a post as a statistician, in his spare time he built a mechanical computer, which he called Z1; for this he used two-state mechanical switches and punched-tape for the program input. This was followed by the design for Z2, which used electromechanical relays.Called to military service in 1939, he was soon sent to the Henschel aircraft factory, where he completed Z2. Between 1939 and 1941 the German Aeronautical Research Institute supported his development of Z3, which used 2,600 relays and a keyboard input. Taken into immediate use by the aircraft industry, both it and its predecessors were destroyed in air raids. Z4, completed towards the end of the war and using mechanical memory, survived, and with improvements was used in Switzerland until 1960. Other achievements by Zuse included a machine to perform logical calculations (LI) and his Plankalkul, one of the first computer languages. In 1950, with two friends, he formed the Zuse KG company near Bad Hersfeld, Essen, and his first Z5 relay computer was sold to Leitz in 1952. A series of machines followed, a milestone in 1958 being the first transistorized machine, Z22, of which over 200 were made. Finally, in 1969, the company was absorbed by Siemens AG and Zuse returned to scientific research.[br]Principal Honours and DistinctionsHonorary Doctorate Berlin Technical University 1960. Honorary Professor Göttingen University 1960.Bibliography11 April 1936, German patent no. Z23 1391X/42M. 16 June 1941, German patent no. Z391.1 August 1949, German patent no. 50,746.1993, The Computer: My Life, Berlin: SpringerVerlag (autobiography).Further ReadingP.E.Ceruzzi, 1981, "The early computers of Konrad Zuse 1935–45", Annals of the History of Computing 3:241.M.R.Williams, 1985, A History of Computing Technology, London: Prentice-Hall.See also: Stibitz, George R.KF
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