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1 purpose
purpose ['pɜ:pəs]1 noun(a) (objective, reason) but m, objet m;∎ what's the purpose of your visit? quel est le but ou l'objet de votre visite?;∎ for or with the purpose of doing sth dans l'intention ou le but de faire qch;∎ he buys real estate for tax purposes il investit dans l'immobilier pour des raisons fiscales;∎ it suits my purposes to stay here j'ai de bonnes raisons de rester ici;∎ to do sth with a purpose in mind or for a purpose faire qch dans un but précis;∎ for this purpose dans ce but, à cet effet;∎ but that's the whole purpose of the exercise! mais tout l'intérêt de l'exercice est là!;∎ to have a sense of purpose être motivé;∎ to give sb a sense of purpose motiver qn;∎ his life lacked any real sense of purpose sa vie était dépourvue de but précis;∎ to have a purpose in life avoir un but dans la vie;∎ her remarks were to the purpose/not to the purpose ses remarques étaient pertinentes/hors de propos∎ what is the purpose of this room/object? à quoi sert cette pièce/cet objet?;∎ the hangar wasn't built for that purpose le hangar n'était pas destiné à cet usage;∎ for all purposes à toutes fins, à tous usages;∎ intended for practical purposes destiné à des usages pratiques;∎ for our purposes pour ce que nous voulons faire;∎ for the purposes of this demonstration pour les besoins de cette démonstration;∎ for the purpose of this article… (in lease, contract etc) au sens du présent article…;∎ £5,000 will be enough for present purposes 5000 livres suffiront à couvrir nos besoins actuels;∎ the funds are to be used for humanitarian purposes les fonds seront utilisés à des fins humanitaires;∎ intended purpose (of building, amount of money) destination f, affectation f;∎ they were never used for their intended purpose ils n'ont jamais servi à l'usage auquel on les destinait;∎ does it serve any useful purpose? est-ce que ça sert à quelque chose?;∎ to serve no purpose ne servir à rien;∎ this will suit or serve your purpose cela fera votre affaire;∎ once she had served her purpose they abandoned her une fois qu'elle eut tenu son rôle, ils l'abandonnèrent;∎ the money will be put or used to good purpose l'argent sera bien employé;∎ he will use his knowledge to good purpose there il pourra y mettre à profit ses connaissances;∎ we are arguing to no purpose nous discutons inutilement;∎ my efforts had been to no purpose mes efforts étaient restés vains;∎ the negotiations have been to little purpose les négociations n'ont pas abouti à grand-chose(c) (determination) résolution f, détermination f;∎ she has great strength of purpose elle a une volonté de fer, c'est quelqu'un de très déterminé∎ literary to purpose to do sth or doing sth se proposer de faire qchexprès;∎ I did it on purpose je l'ai fait exprès;∎ I avoided the subject on purpose j'ai fait exprès d'éviter ou j'ai délibérément évité la question -
2 Poniatoff, Alexander Mathew
[br]b. 25 March 1892 Kazan District, Russiad. 24 October 1980[br]Russian (naturalized American in 1932) electrical engineer responsible for the development of the professional tape recorder and the first commercially-successful video tape recorder (VTR).[br]Poniatoff was educated at the University of Kazan, the Imperial College in Moscow, and the Technische Hochschule in Karlsruhe, gaining degrees in mechanical and electrical engineering. He was in Germany when the First World War broke out, but he managed to escape back to Russia, where he served as an Air Force pilot with the Imperial Russian Navy. During the Russian Revolution he was a pilot with the White Russian Forces, and escaped into China in 1920; there he found work as an assistant engineer in the Shanghai Power Company. In 1927 he immigrated to the USA, becoming a US citizen in 1932. He obtained a post in the research and development department of the General Electric Company in Schenectady, New York, and later at Dalmo Victor, San Carlos, California. During the Second World War he was involved in the development of airborne radar for the US Navy.In 1944, taking his initials to form the title, Poniatoff founded the AMPEX Corporation to manufacture components for the airborne radar developed at General Electric, but in 1946 he turned to the production of audio tape recorders developed from the German wartime Telefunken Magnetophon machine (the first tape recorder in the truest sense). In this he was supported by the entertainer Bing Crosby, who needed high-quality replay facilities for broadcasting purposes, and in 1947 he was able to offer a professional-quality product and the business prospered.With the rapid post-war boom in television broadcasting in the USA, a need soon arose for a video recorder to provide "time-shifting" of live TV programmes between the different US time zones. Many companies therefore endeavoured to produce a video tape recorder (VTR) using the same single-track, fixed-head, longitudinal-scan system used for audio, but the very much higher bandwidth required involved an unacceptably high tape-speed. AMPEX attempted to solve the problem by using twelve parallel tracks and a machine was demonstrated in 1952, but it proved unsatisfactory.The development team, which included Charles Ginsburg and Ray Dolby, then devised a four-head transverse-scan system in which a quadruplex head rotating at 14,400 rpm was made to scan across the width of a 2 in. (5 cm) tape with a tape-to-head speed of the order of 160 ft/sec (about 110 mph; 49 m/sec or 176 km/h) but with a longitudinal tape speed of only 15 in./sec (0.38 m/sec). In this way, acceptable picture quality was obtained with an acceptable tape consumption. Following a public demonstration on 14 April 1956, commercial produc-tion of studio-quality machines began to revolutionize the production and distribution of TV programmes, and the perfecting of time-base correctors which could stabilize the signal timing to a few nanoseconds made colour VTRs a practical proposition. However, AMPEX did not rest on its laurels and in the face of emerging competition from helical scan machines, where the tracks are laid diagonally on the tape, the company was able to demonstrate its own helical machine in 1957. Another development was the Videofile system, in which 250,000 pages of facsimile could be recorded on a single tape, offering a new means of archiving information. By 1986, quadruplex VTRs were obsolete, but Poniatoff's role in making television recording possible deserves a place in history.Poniatoff was President of AMPEX Corporation until 1955 and then became Chairman of the Board, a position he held until 1970.[br]Further ReadingA.Abrahamson, 1953, "A short history of television recording", Part I, JSMPTE 64:73; 1973, Part II, Journal of the Society of Motion Picture and Television Engineers, 82:188 (provides a fuller background).Audio Biographies, 1961, ed. G.A.Briggs, Wharfedale Wireless Works, pp. 255–61 (contains a few personal details about Poniatoff's escape from Germany to join the Russian Navy).E.Larsen, 1971, A History of Invention.Charles Ginsburg, 1981, "The horse or the cowboy. Getting television on tape", Journal of the Royal Television Society 18:11 (a brief account of the AMPEX VTR story).KF / GB-NBiographical history of technology > Poniatoff, Alexander Mathew
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