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1 Chapman mechanism
Макаров: механизм Чепмена -
2 Chapman mechanism
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3 механизм Чепмена
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4 механизм
1.assembly 2.device 3.mechanismмеханизм боковой разгрузкимеханизм вспышкиflare mechanismмеханизм выпадения и соударения механизм грубого наведенияslewing-drive assembly (of telescope)механизм затвораshutter mechanismмеханизм излученияgeneration mechanismмеханизм контрастаcontrast mechanismмеханизм ЛайтхиллаLighthill mechanismмеханизм ПечекаPetschek’s mechanismмеханизм подачиfeed unitмеханизм приводаmain-gear drives (of radio telescope)механизм привода телескопа1.drive mechanism 2.drive systemмеханизм привода телескопа по склонениюdeclination-drive systemмеханизм привода телескопа по часовому углуhour-angle drive systemмеханизм происхожденияmechanism of originмеханизм радиоизлученияmechanism of radio emissionмеханизм разгрузкиsupport mechanismмеханизм разгрузки зеркалаmirror’s suppoprtмеханизм рассеянияscattering mechanismмеханизм СвитаSweet’s mechanismмеханизм торцевой разгрузкиback support (of telescope mirror)механизм точного наведенияslow-motion drive assembly (of telescope)механизм узла первичного фокусаprime-focus optical assembly (of mirror)механизм уширения спектральных линийbroadening mechanismмеханизм ЧепменаChapman mechanismгиревой часовой механизм1.gravity(-driven) clock 2.gravity-powered clockкогерентный механизмphase coherent mechanism (of radio emission)нетепловой механизмnonthermal process (of emission)реверсивный механизмreversal mechanismсинхротронный механизмsynchrotron mechanism (of emission)тепловой механизмthermal processчасовой механизм1.driving clock device 2.telescope driving mechanism 3.telescope drive system 4.sidereal driveчасовой механизм в шкале звездного времениsidereal-rate tracking mechanismчасовой гиревой механизмgravity (-powered) driveчасовой электрический механизм1.electric-motor drive 2.electric-motor sidereal drive -
5 механизм Чепмена
Makarov: Chapman mechanism -
6 Parsons, Sir Charles Algernon
[br]b. 13 June 1854 London, Englandd. 11 February 1931 on board Duchess of Richmond, Kingston, Jamaica[br]English eingineer, inventor of the steam turbine and developer of the high-speed electric generator.[br]The youngest son of the Earl of Rosse, he came from a family well known in scientific circles, the six boys growing up in an intellectual atmosphere at Birr Castle, the ancestral home in Ireland, where a forge and large workshop were available to them. Charles, like his brothers, did not go to school but was educated by private tutors of the character of Sir Robert Ball, this type of education being interspersed with overseas holiday trips to France, Holland, Belgium and Spain in the family yacht. In 1871, at the age of 17, he went to Trinity College, Dublin, and after two years he went on to St John's College, Cambridge. This was before the Engineering School had opened, and Parsons studied mechanics and mathematics.In 1877 he was apprenticed to W.G.Armstrong \& Co. of Elswick, where he stayed for four years, developing an epicycloidal engine that he had designed while at Cambridge. He then moved to Kitson \& Co. of Leeds, where he went half shares in a small experimental shop working on rocket propulsion for torpedoes.In 1887 he married Katherine Bethell, who contracted rheumatic fever from early-morning outdoor vigils with her husband to watch his torpedo experiments while on their honeymoon! He then moved to a partnership in Clarke, Chapman \& Co. at Gateshead. There he joined the electrical department, initially working on the development of a small, steam-driven marine lighting set. This involved the development of either a low-speed dynamo, for direct coupling to a reciprocating engine, or a high-speed engine, and it was this requirement that started Parsons on the track of the steam turbine. This entailed many problems such as the running of shafts at speeds of up to 40,000 rpm and the design of a DC generator for 18,000 rpm. He took out patents for both the turbine and the generator on 23 April 1884. In 1888 he dissolved his partnership with Clarke, Chapman \& Co. to set up his own firm in Newcastle, leaving his patents with the company's owners. This denied him the use of the axial-flow turbine, so Parsons then designed a radial-flow layout; he later bought back his patents from Clarke, Chapman \& Co. His original patent had included the use of the steam turbine as a means of marine propulsion, and Parsons now set about realizing this possibility. He experimented with 2 ft (61 cm) and 6 ft (183 cm) long models, towed with a fishing line or, later, driven by a twisted rubber cord, through a single-reduction set of spiral gearing.The first trials of the Turbinia took place in 1894 but were disappointing due to cavitation, a little-understood phenomenon at the time. He used an axial-flow turbine of 2,000 shp running at 2,000 rpm. His work resulted in a far greater understanding of the phenomenon of cavitation than had hitherto existed. Land turbines of up to 350 kW (470 hp) had meanwhile been built. Experiments with the Turbinia culminated in a demonstration which took place at the great Naval Review of 1897 at Spithead, held to celebrate Queen Victoria's Diamond Jubilee. Here, the little Turbinia darted in and out of the lines of heavy warships and destroyers, attaining the unheard of speed of 34.5 knots. The following year the Admiralty placed their first order for a turbine-driven ship, and passenger vessels started operation soon after, the first in 1901. By 1906 the Admiralty had moved over to use turbines exclusively. These early turbines had almost all been direct-coupled to the ship's propeller shaft. For optimum performance of both turbine and propeller, Parsons realized that some form of reduction gearing was necessary, which would have to be extremely accurate because of the speeds involved. Parsons's Creep Mechanism of 1912 ensured that any errors in the master wheel would be distributed evenly around the wheel being cut.Parsons was also involved in optical work and had a controlling interest in the firm of Ross Ltd of London and, later, in Sir Howard Grubb \& Sons. He he was an enlightened employer, originating share schemes and other benefits for his employees.[br]Principal Honours and DistinctionsKnighted. Order of Merit 1927.Further ReadingA.T.Bowden, 1966, "Charles Parsons: Purveyor of power", in E.G.Semler (ed.), The Great Masters. Engineering Heritage, Vol. II, London: Institution of Mechanical Engineers/Heinemann.IMcNBiographical history of technology > Parsons, Sir Charles Algernon
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7 Lee, Revd William
SUBJECT AREA: Textiles[br]d. c. 1615[br]English inventor of the first knitting machine, called the stocking frame.[br]It would seem that most of the stories about Lee's invention of the stocking frame cannot be verified by any contemporary evidence, and the first written accounts do not appear until the second half of the seventeenth century. The claim that he was Master of Arts from St John's College, Cambridge, was first made in 1607 but cannot be checked because the records have not survived. The date for the invention of the knitting machine as being 1589 was made at the same time, but again there is no supporting evidence. There is no evidence that Lee was Vicar of Calverton, nor that he was in Holy Orders at all. Likewise there is no evidence for the existence of the woman, whether she was girlfriend, fiancée or wife, who is said to have inspired the invention, and claims regarding the involvement of Queen Elizabeth I and her refusal to grant a patent because the stockings were wool and not silk are also without contemporary foundation. Yet the first known reference shows that Lee was the inventor of the knitting machine, for the partnership agreement between him and George Brooke dated 6 June 1600 states that "William Lee hath invented a very speedy manner of making works usually wrought by knitting needles as stockings, waistcoats and such like". This agreement was to last for twenty-two years, but terminated prematurely when Brooke was executed for high treason in 1603. Lee continued to try and exploit his invention, for in 1605 he described himself as "Master of Arts" when he petitioned the Court of Aldermen of the City of London as the first inventor of an engine to make silk stockings. In 1609 the Weavers' Company of London recorded Lee as "a weaver of silk stockings by engine". These petitions suggest that he was having difficulty in establishing his invention, which may be why in 1612 there is a record of him in Rouen, France, where he hoped to have better fortune. If he had been invited there by Henry IV, his hopes were dashed by the assassination of the king soon afterwards. He was to supply four knitting machines, and there is further evidence that he was in France in 1615, but it is thought that he died in that country soon afterwards.The machine Lee invented was probably the most complex of its day, partly because the need to use silk meant that the needles were very fine. Henson (1970) in 1831 took five pages in his book to describe knitting on a stocking frame which had over 2,066 pieces. To knit a row of stitches took eleven separate stages, and great care and watchfulness were required to ensure that all the loops were equal and regular. This shows how complex the machines were and points to Lee's great achievement in actually making one. The basic principles of its operation remained unaltered throughout its extraordinarily long life, and a few still remained in use commercially in the early 1990s.[br]Further ReadingJ.T.Millington and S.D.Chapman (eds), 1989, Four Centuries of Machine Knitting, Commemorating William Lee's Invention of the Stocking Frame in 1589, Leicester (N.Harte examines the surviving evidence for the life of William Lee and this must be considered as the most up-to-date biographical information).Dictionary of National Biography (this contains only the old stories).Earlier important books covering Lee's life and invention are G.Henson, 1970, History of the Framework Knitters, reprint, Newton Abbot (orig. pub. 1831); and W.Felkin, 1967, History of the Machine-wrought Hosiery and Lace Manufactures, reprint, Newton Abbot (orig. pub. 1867).M.Palmer, 1984, Framework Knitting, Aylesbury (a simple account of the mechanism of the stocking frame).R.L.Hills, "William Lee and his knitting machine", Journal of the Textile Institute 80(2) (a more detailed account).M.Grass and A.Grass, 1967, Stockings for a Queen. The Life of William Lee, the Elizabethan Inventor, London.RLH
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