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1 length of work admitted
Автоматика: наибольшая длина изделияУниверсальный англо-русский словарь > length of work admitted
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2 length of work admitted
English-Russian dictionary of mechanical engineering and automation > length of work admitted
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3 length
1) длина; протяжённость; расстояние2) длительность; продолжительность3) секция (напр. трубы)•- arc length
- average base tangent length
- back end working length
- base tangent length
- bearing length
- braking length
- chucking length
- closing length
- collapsing length
- contact length
- cross-sectional cut length
- cross-sectional length
- cutting length
- developed profile length
- drilling length
- effective length
- effective tooth contact length
- evaluation length
- extended length of spring
- extension length
- extra length
- extreme length
- feed length of tool slide
- feed length
- fixed word length
- focal length
- gage length
- gaged length
- grid length
- grinding length
- grip length
- housing length
- inside length
- installed length
- length of action
- length of bed
- length of contact between teeth
- length of contact
- length of cut
- length of line of action
- length of thread engagement
- length of tooth profile modification
- length of tooth
- length of work admitted
- length of working face of tooth
- length of worm
- maximum planing length
- maximum turned length
- measuring length
- milling length
- net endless length
- nominal base tangent length
- offcut length
- over length
- overall length
- overhanging length
- pad length
- partial length
- part-program length
- peripheral length
- pitch length
- planing length
- press length
- profile bearing length
- projection length
- queue length
- reference length of the profile
- relative reference length of the profile
- remnant length
- repeat feed length
- root length
- runway length
- sampling length
- sawed length
- sawn length
- scale length
- specified length
- starting length
- stretched length of spring
- stripe length
- stroke length
- test length
- threaded length
- tracing length
- transverse strain gage length
- traversed length
- traversing length
- turned length
- turning length
- unsupported lengthEnglish-Russian dictionary of mechanical engineering and automation > length
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4 Hopkinson, John
[br]b. 27 July 1849 Manchester, Englandd. 27 August 1898 Petite Dent de Veisivi, Switzerland[br]English mathematician and electrical engineer who laid the foundations of electrical machine design.[br]After attending Owens College, Manchester, Hopkinson was admitted to Trinity College, Cambridge, in 1867 to read for the Mathematical Tripos. An appointment in 1872 with the lighthouse department of the Chance Optical Works in Birmingham directed his attention to electrical engineering. His most noteworthy contribution to lighthouse engineering was an optical system to produce flashing lights that distinguished between individual beacons. His extensive researches on the dielectric properties of glass were recognized when he was elected to a Fellowship of the Royal Society at the age of 29. Moving to London in 1877 he became established as a consulting engineer at a time when electricity supply was about to begin on a commercial scale. During the remainder of his life, Hopkinson's researches resulted in fundamental contributions to electrical engineering practice, dynamo design and alternating current machine theory. In making a critical study of the Edison dynamo he developed the principle of the magnetic circuit, a concept also arrived at by Gisbert Kapp around the same time. Hopkinson's improvement of the Edison dynamo by reducing the length of the field magnets almost doubled its output. In 1890, in addition to-his consulting practice, Hopkinson accepted a post as the first Professor of Electrical Engineering and Head of the Siemens laboratory recently established at King's College, London. Although he was not involved in lecturing, the position gave him the necessary facilities and staff and student assistance to continue his researches. Hopkinson was consulted on many proposals for electric traction and electricity supply, including schemes in London, Manchester, Liverpool and Leeds. He also advised Mather and Platt when they were acting as contractors for the locomotives and generating plant for the City and South London tube railway. As early as 1882 he considered that an ideal method of charging for the supply of electricity should be based on a two-part tariff, with a charge related to maximum demand together with a charge for energy supplied. Hopkinson was one the foremost expert witnesses of his day in patent actions and was himself the patentee of over forty inventions, of which the three-wire system of distribution and the series-parallel connection of traction motors were his most successful. Jointly with his brother Edward, John Hopkinson communicated the outcome of his investigations to the Royal Society in a paper entitled "Dynamo Electric Machinery" in 1886. In this he also described the later widely used "back to back" test for determining the characteristics of two identical machines. His interest in electrical machines led him to more fundamental research on magnetic materials, including the phenomenon of recalescence and the disappearance of magnetism at a well-defined temperature. For his work on the magnetic properties of iron, in 1890 he was awarded the Royal Society Royal Medal. He was a member of the Alpine Club and a pioneer of rock climbing in Britain; he died, together with three of his children, in a climbing accident.[br]Principal Honours and DistinctionsFRS 1878. Royal Society Royal Medal 1890. President, Institution of Electrical Engineers 1890 and 1896.Bibliography7 July 1881, British patent no. 2,989 (series-parallel control of traction motors). 27 July 1882, British patent no. 3,576 (three-wire distribution).1901, Original Papers by the Late J.Hopkinson, with a Memoir, ed. B.Hopkinson, 2 vols, Cambridge.Further ReadingJ.Greig, 1970, John Hopkinson Electrical Engineer, London: Science Museum and HMSO (an authoritative account).—1950, "John Hopkinson 1849–1898", Engineering 169:34–7, 62–4.GW
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