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1 technical advances
Englisch-Deutsch Fachwörterbuch der Wirtschaft > technical advances
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2 technical advances
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3 technical advances
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4 technical advances
Большой англо-русский и русско-английский словарь > technical advances
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5 technical
['tɛknɪkl]adjadvances techniczny; terms, language techniczny, fachowy* * *['teknikəl]1) (having, or relating to, a particular science or skill, especially of a mechanical or industrial kind: a technical college; technical skill; technical drawing.) techniczny2) ((having many terms) relating to a particular art or science: `Myopia' is a technical term for `short-sightedness'.) fachowy3) (according to strict laws or rules: a technical defeat.) formalny•- technically
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6 технические изменения
Большой англо-русский и русско-английский словарь > технические изменения
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7 технический развитие
Большой англо-русский и русско-английский словарь > технический развитие
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8 Huygens, Christiaan
SUBJECT AREA: Horology[br]b. 14 April 1629 The Hague, the Netherlandsd. 8 June 1695 The Hague, the Netherlands[br]Dutch scientist who was responsible for two of the greatest advances in horology: the successful application of both the pendulum to the clock and the balance spring to the watch.[br]Huygens was born into a cultured and privileged class. His father, Constantijn, was a poet and statesman who had wide interests. Constantijn exerted a strong influence on his son, who was educated at home until he reached the age of 16. Christiaan studied law and mathematics at Ley den University from 1645 to 1647, and continued his studies at the Collegium Arausiacum in Breda until 1649. He then lived at The Hague, where he had the means to devote his time entirely to study. In 1666 he became a Member of the Académie des Sciences in Paris and settled there until his return to The Hague in 1681. He also had a close relationship with the Royal Society and visited London on three occasions, meeting Newton on his last visit in 1689. Huygens had a wide range of interests and made significant contributions in mathematics, astronomy, optics and mechanics. He also made technical advances in optical instruments and horology.Despite the efforts of Burgi there had been no significant improvement in the performance of ordinary clocks and watches from their inception to Huygens's time, as they were controlled by foliots or balances which had no natural period of oscillation. The pendulum appeared to offer a means of improvement as it had a natural period of oscillation that was almost independent of amplitude. Galileo Galilei had already pioneered the use of a freely suspended pendulum for timing events, but it was by no means obvious how it could be kept swinging and used to control a clock. Towards the end of his life Galileo described such a. mechanism to his son Vincenzio, who constructed a model after his father's death, although it was not completed when he himself died in 1642. This model appears to have been copied in Italy, but it had little influence on horology, partly because of the circumstances in which it was produced and possibly also because it differed radically from clocks of that period. The crucial event occurred on Christmas Day 1656 when Huygens, quite independently, succeeded in adapting an existing spring-driven table clock so that it was not only controlled by a pendulum but also kept it swinging. In the following year he was granted a privilege or patent for this clock, and several were made by the clockmaker Salomon Coster of The Hague. The use of the pendulum produced a dramatic improvement in timekeeping, reducing the daily error from minutes to seconds, but Huygens was aware that the pendulum was not truly isochronous. This error was magnified by the use of the existing verge escapement, which made the pendulum swing through a large arc. He overcame this defect very elegantly by fitting cheeks at the pendulum suspension point, progressively reducing the effective length of the pendulum as the amplitude increased. Initially the cheeks were shaped empirically, but he was later able to show that they should have a cycloidal shape. The cheeks were not adopted universally because they introduced other defects, and the problem was eventually solved more prosaically by way of new escapements which reduced the swing of the pendulum. Huygens's clocks had another innovatory feature: maintaining power, which kept the clock going while it was being wound.Pendulums could not be used for portable timepieces, which continued to use balances despite their deficiencies. Robert Hooke was probably the first to apply a spring to the balance, but his efforts were not successful. From his work on the pendulum Huygens was well aware of the conditions necessary for isochronism in a vibrating system, and in January 1675, with a flash of inspiration, he realized that this could be achieved by controlling the oscillations of the balance with a spiral spring, an arrangement that is still used in mechanical watches. The first model was made for Huygens in Paris by the clockmaker Isaac Thuret, who attempted to appropriate the invention and patent it himself. Huygens had for many years been trying unsuccessfully to adapt the pendulum clock for use at sea (in order to determine longitude), and he hoped that a balance-spring timekeeper might be better suited for this purpose. However, he was disillusioned as its timekeeping proved to be much more susceptible to changes in temperature than that of the pendulum clock.[br]Principal Honours and DistinctionsFRS 1663. Member of the Académie Royale des Sciences 1666.BibliographyFor his complete works, see Oeuvres complètes de Christian Huygens, 1888–1950, 22 vols, The Hague.1658, Horologium, The Hague; repub., 1970, trans. E.L.Edwardes, AntiquarianHorology 7:35–55 (describes the pendulum clock).1673, Horologium Oscillatorium, Paris; repub., 1986, The Pendulum Clock or Demonstrations Concerning the Motion ofPendula as Applied to Clocks, trans.R.J.Blackwell, Ames.The balance spring watch was first described in Journal des Sçavans 25 February 1675, and translated in Philosophical Transactions of the Royal Society (1675) 4:272–3.Further ReadingH.J.M.Bos, 1972, Dictionary of Scientific Biography, ed. C.C.Gillispie, Vol. 6, New York, pp. 597–613 (for a fuller account of his life and scientific work, but note the incorrect date of his death).R.Plomp, 1979, Spring-Driven Dutch Pendulum Clocks, 1657–1710, Schiedam (describes Huygens's application of the pendulum to the clock).S.A.Bedini, 1991, The Pulse of Time, Florence (describes Galileo's contribution of the pendulum to the clock).J.H.Leopold, 1982, "L"Invention par Christiaan Huygens du ressort spiral réglant pour les montres', Huygens et la France, Paris, pp. 154–7 (describes the application of the balance spring to the watch).A.R.Hall, 1978, "Horology and criticism", Studia Copernica 16:261–81 (discusses Hooke's contribution).DV -
9 Halsted, William Stewart
SUBJECT AREA: Medical technology[br]b. 23 September 1852 Baltimore, Maryland, USAd. 7 September 1922 Baltimore, Maryland, USA[br]American surgeon, originator of the surgical use of rubber gloves and silk ligatures.[br]After education at Yale University, he studied at the College of Physicians and Surgeons of New York, qualifying in 1877. Following internships in New York, he spent two postgraduate years in Germany and Austria, where he became acquainted with the German methods of surgical education. He returned to New York in 1880 to practise privately and also demonstrate anatomy at the College.In 1884, when experimenting with cocaine as an anaesthetic, he became addicted; he underwent treatment for his addiction in 1886–7 and there is also some evidence of treatment for morphine addiction in 1892. As a consequence of these problems he moved to Johns Hopkins Hospital in Baltimore, where he was appointed Surgeon-in-Chief in 1890 and Professor of Surgery in 1892. In this role he devoted considerable time to laboratory study and made important contributions in the treatment of breast carcinoma, thyroid disease and aneurism. A perfectionist, his technical advances were an outcome of his approach to surgery, which was methodical and painstaking in comparison with the cavalier methods of some contemporaries.[br]Bibliography1894, Johns Hopkins Hospital Reports, Baltimore (rubber gloves).1924, Surgical Papers by William Stewart Halsted, ed. W.C.Berket, Baltimore.Further ReadingW.G.McCallum, 1930, William Stewart Halsted, Surgeon, Baltimore.MGBiographical history of technology > Halsted, William Stewart
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10 Koch, Robert
SUBJECT AREA: Medical technology[br]b. 11 December 1843 Clausthal, Hannover, Germanyd. 28 May 1910 Baden-Baden, Germany[br]German bacteriologist and innovator of many bacteriological techniques, including the process of bacteria-free water filtration and the introduction of solid cultivation media.[br]Koch studied medicine at Gottingen and graduated MD in 1866. He served in the war of 1870, and in 1872 was appointed Medical Officer at Wollstein. It was there that he commenced his bacteriological researches which led to numerous technical advances and the culture of the anthrax bacillus in 1876.Appointed in 1880 to the Imperial Health Office in Berlin, he perfected his methods and was appointed Professor of Hygiene in the University of Berlin in 1885. From 1886 he was editor of the Zeitschrift für Hygiene und Infektionskrank-heiten, which was published in Leipzig. In 1891 he became Director of the Institute for Infectious Diseases, founded for him in Berlin. He had already discovered the tubercle bacillus in 1882 and the cholera vibrio in 1883. He travelled extensively in India, Africa and South Africa in connection with research into bubonic plague, malaria, rinderpest and sleeping sickness. His name will always be associated with Koch's postulates, the propositions which need to be satisfied before attributing a disease to a specific infective agent.[br]Principal Honours and DistinctionsNobel Prize for Medicine or Physiology 1905.Bibliography1877, "Verfahrungen zur Untersuchung zum Conservieren und Photographieren der Bacterien", Beitr. Biol. Pflanzen.Further ReadingM.Kirchner, 1924, Robert Koch.MG -
11 advance
1. n2) прогресс; достижение, успех3) эк. повышение, увеличение, рост4) предварительная подготовка к избирательной кампании; подготовительные мероприятия (к визиту государственного деятеля, делегации и т.п.)5) подготовка демонстраций, подготовка предвыборных мероприятий, подготовка предвыборных митингов, подготовка предвыборных собраний и т.д.6) заранее подготовленный репортаж (о каком-л. событии)7) предварительно разосланный текст (заявления, речи и т.п.)8) воен. наступление9) аванс, заем, ссуда10) pl заигрывания•to grant an advance — предоставлять заем / ссуду
to make advances to a country — заигрывать с какой-л. страной ( с целью вступить в переговоры)
to obtain an advance — получать аванс / заем / ссуду
to receive an advance on royalties — получать аванс в счет роялти / гонорара
- advance againstto stave off the advances of smb — отражать чье-л. наступление
- advance in living standards
- advance in the cost of living
- advance of science
- advance of wages
- advance on
- advance to
- advance towards
- considerable advances
- economic advance
- in advance of a meeting
- industrial advance
- military advances
- price advance
- progressive advance
- salary advance
- scientific and technical advance
- significant advances
- social advance
- spiritual advance
- technical advance
- technological advance 2. v1) идти, продвигаться вперед2) прогрессировать; добиваться достижений, делать успехи3) повышать, увеличивать (цены и т.п.); повышаться, увеличиваться, расти (о ценах и т.п.)4) продвигать, повышать ( по службе)5) продвигаться ( по службе)6) вносить, выдвигать (проект резолюции и т.п.)7) воен. наступать8) предоставлять заем, предоставлять ссуду•to advance against / on / to / towards — продвигаться к / по направлению к
- our troops advanced on the next townto advance steadily — уверенно идти / продвигаться вперед
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12 advance
1. n- thwart the advance of smth.2) прогресс; успех, улучшение3) амер. предварительная подготовка к избирательной кампании; подготовительные мероприятия (к визиту государственного деятеля и т.п.)4) заранее подготовленный репортаж (о намечающемся событии, предстоящей церемонии и т.п.)5) предварительно разосланный текст (речи, выступления и т.п.)6) воен. наступление7) эк. рост, повышение (цен), увеличение8) эк. заём, ссуда•2. v3) вносить, выдвигать (предложение и т.п.)4) амер. проводить предварительные мероприятия по организации выступлений, встречи, приёма политического деятеля, кандидата в президенты и т.п.5) повышать(ся) (о ценах) -
13 technologic
прил.
1) технологический technologic advance ≈ технологический прогресс
2) промышленный, технический technologic innovations ≈ новинки техники technologic forecasting ≈ техническое прогнозирование technologic unemployment ≈ безработица в результате технического прогресса Syn: technical
3) особый, специальный technologic knowledge ≈ специальные знания Syn: special, especial технологический - * advance технологический прогресс - advances in * productivity совершенствование технологии технический - * innovations новинки техники - * forecasting техническое прогнозирование (методы прогнозирования потенциального развития техники) - * unemployment безработица в результате технического прогресса - the future will offer new * opportunities в будущем появятся новые технические возможности специальный - * knowledge специальные знанияБольшой англо-русский и русско-английский словарь > technologic
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14 technological
прил.
1) технологический technologic advance ≈ технологический прогресс
2) промышленный, технический technologic innovations ≈ новинки техники technologic forecasting ≈ техническое прогнозирование technologic unemployment ≈ безработица в результате технического прогресса Syn: technical
3) особый, специальный technologic knowledge ≈ специальные знания Syn: special, especial технологический - * advance технологический прогресс - advances in * productivity совершенствование технологии технический - * innovations новинки техники - * forecasting техническое прогнозирование (методы прогнозирования потенциального развития техники) - * unemployment безработица в результате технического прогресса - the future will offer new * opportunities в будущем появятся новые технические возможности специальный - * knowledge специальные знанияБольшой англо-русский и русско-английский словарь > technological
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15 production
n1) изготовление; производство2) продукция•to cut (back) production — свертывать / сокращать производство
to diversify production — диверсифицировать / разнообразить продукцию
to limit production — ограничивать / сокращать производство
- anarchy of productionto reduce production — свертывать / сокращать производство
- animal production
- annual production
- arms production
- atomic power and energy production
- automation of production
- batch production
- coal production
- commercial production
- commodity production
- comprehensive mechanization of production
- continuous production
- costs of production
- crop production
- current production
- curtailment ofproduction
- cutback of production
- cuts in production
- daily production
- decline in production
- domestic production
- drop in production
- economically effective production
- effectiveness of production
- end production
- energy production - fertilizer production
- fishing production
- flexible production
- flow production
- food production
- full-scale production of the neutron bomb
- global production
- high production
- high-cost production
- highly organized production
- highly remunerative production
- improvement of effectiveness of production
- improvement of production
- individual production
- industrial production
- joint production
- labor-intensive production
- lagging industrial production
- large-scale production - line production
- machine mode of production
- mass production
- material production
- means of production
- mechanized production
- mode of production
- nonspecialized production
- nonwaste production
- per capita production
- per head production
- pilot production
- planned production
- power production
- production advances rapidly
- production declines
- production decreases
- production falls
- production increases
- production of consumer goods
- production of illicit alcohol
- production of means of production
- production outstrips demand
- production rises
- profitable production
- public production
- rate of production
- runaway production
- scale of production
- self-reliance in production
- self-sufficiency in production
- serial production
- short-run production
- small-scale production
- social character of production
- social production - sphere of material production
- stagnant production
- steel production
- structure of industrial production
- subsidiary production
- subsistence production
- switchover from military to civilian production
- technical reequipment of production - total world production
- unequally distributed food production
- uninterrupted development of production
- unprofitable production - war production
- waste-free production
- wasteful production
- wasteless production
- well organized production
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16 make
[meik] 1. past tense, past participle - made; verb1) (to create, form or produce: God made the Earth; She makes all her own clothes; He made it out of paper; to make a muddle/mess of the job; to make lunch/coffee; We made an arrangement/agreement/deal/bargain.) narediti2) (to compel, force or cause (a person or thing to do something): They made her do it; He made me laugh.) pripraviti koga do česa3) (to cause to be: I made it clear; You've made me very unhappy.) narediti4) (to gain or earn: He makes $100 a week; to make a profit.) zaslužiti5) ((of numbers etc) to add up to; to amount to: 2 and 2 make(s) 4.) znašati6) (to become, turn into, or be: He'll make an excellent teacher.) postati7) (to estimate as: I make the total 483.) oceniti8) (to appoint, or choose, as: He was made manager.) imenovati9) (used with many nouns to give a similar meaning to that of the verb from which the noun is formed: He made several attempts (= attempted several times); They made a left turn (= turned left); He made (= offered) a suggestion/proposal; Have you any comments to make?)2. noun(a (usually manufacturer's) brand: What make is your new car?) znamka- maker- making
- make-believe
- make-over
- makeshift
- make-up
- have the makings of
- in the making
- make a/one's bed
- make believe
- make do
- make for
- make it
- make it up
- make something of something
- make of something
- make something of
- make of
- make out
- make over
- make up
- make up for
- make up one's mind
- make up to* * *I [méik]noundelo, izdelovanje; economy izdelek, fabrikat, proizvod, (tovarniška) znamka; kroj, fasona; technical vrsta, oblika, tip, proizvodnja; postava, stas; zgradba (zgodbe); electrical spoj, kontakt; napoved aduta (bridge), mešanje kartof best English make — najboljše angl. kvaliteteelectrical to be at make — biti spojenslang to be on the make — biti na lovu za denarjem, za dobičkom; vzpenjati se (družbeno)British English nautical make and mend — prost čas za mornarjeII [méik]1.transitive verbdelati, napraviti; izdelati, izdelovati (from, of, out, of iz); predelati, predelovati, tvoriti, oblikovati (to, into v); pripraviti (kavo, čaj); uvesti (pravila, zakone), sestaviti, spisati (pesem); zbrati (glasove); ustvariti; figuratively napraviti kaj iz koga (to make a doctor of s.o.); povzročiti, prinašati (zadovoljstvo); pokazati se, postaviti, biti ( she ŋs him a good wife); znesti, znašati; imenovati za ( he was made a general); (z nedoločnikom brez "to" v aktivu, s "to" v pasivu) pripraviti koga do česa (they made him talk, he was made to talk); meniti, misliti, predstavljati si ( what do you make of it); colloquially imeti koga za kaj ( I make him an honest man); zaslužiti, ustvariti dobiček; doseči (hitrost), premeriti (pot); slang zapeljati, posiliti; prispeti (ladja v pristanišče), doseči; nautical zagledati (kopno); British English jesti; imeti (govor); mešati karte; electrical spojiti American slang identificirati koga;2.intransitive verbnameniti se, poskusiti, napotiti se, peljati (pot) razprostirati se, teči (reka) (to); nastopiti (plima), naraščati (voda); figuratively povzročiti, pripeljati doto make allowance for — upoštevati, biti uvidevento make amends for — odškodovati, oddolžiti se za kajto make as if ( —ali as though) — pretvarjati se, hlinitias you make your bed so you must lie upon it — kakor boš postlal, tako bož ležalto make believe — pretvarjati se, hlinitito make a bid for — truditi se za, potegovati se za kajto make bold — drzniti si, upati sito make no bones about — povedati odkrito brez strahu, požvižgati se na kajto make or break s.o. — pripeljati koga do uspeha ali polomato make a clean breast of — priznati, olajšati si srceto make the best of — izkoristiti kar najbolje, napraviti kar se le da, sprijazniti se s čimto make clear — objasniti, razložitito make the door upon s.o. — zapreti komu vratato make a difference to — biti važno, spremeniti stvarto make both ends meet — shajati s svojimi sredstvi, prilagoditi izdatke dohodkomto make eyes at — spogledovati se, zaljubljeno koga gledatito make excuses — opravičevati se, izgovarjati se, izvijati seto make an exhibition of o.s. — spozabiti seto make a fool of o.s. — biti za norcato make a fool of s.o. — imeti koga za norcato make free with — brez zadrege uporabljati, razpolagati s čimto make fun ( —ali game) of — zasmehovati koga, zafrkavatito make s.th. good — povrniti, kriti, nadoknaditito make a hash of — pokvariti, zavozlati (zgodbo)American to make a hit — postati popularento make o.s. at home — biti kakor domaAmerican to make it — uspetinautical to make it so — izvršiti nalogto make it hot for s.o. — naščuvati javnost proti komu, preganjati kogato make things humorously gladko izpeljati (da teče kot po maslu)to make known — sporočiti, objavitito make land — zagledati kopno, pripluti v pristaniščeto make light ( —ali little) of — podcenjevati, nalahko jematislang to make like — posnematito make one's own life — živeti svoje življenje, hoditi svojo potto make love to — ljubimkati, spolno občevati s komto make one's mark — napraviti karijero, izkazati seto make merry — hrupno proslavljati, bučno se veselitito make minoemeat of — izpodbiti, popolnoma premagatito make money — dobro zaslužiti, obogatetito make s.o.'s mouth water — vzbuditi zavist ali željoto make move — lotiti se česa, odpraviti se, krenitito make much of — ceniti, pripisovati važnost čemu, imeti od česa veliko koristito make a name for o.s. — napraviti si imeto make a noise in the world — postati slaven, zaslovetito make nothing of — ne razumeti, biti zmedento make of — tolmačiti, razlagati sito make the pace — voditi, diktirati tempoto make passes at — objemati, ljubkovati, dvoritito make one's pile — obogateti, spraviti denar na kupto make a plunge — lotiti se brez pomisleka, visoko stavitinautical to make port — pripluti v pristaniščeto make a point of — vztrajati pri čem, predvsem se potruditito make a practice of — imeti navado, navaditi seto make a racket — biti zelo hrupen, razgrajatito make sail — odpluti, odjadratito make o.s. scarce — izginitito make no secret of — ne prikrivati, odkrito pokazati ali povedatito make shift with — pomagati si, nekako ureditito make s.o. sit up — koga zelo presenetitito make s.o. sore — razjeziti koganautical to make sternway — ritensko pluti, zaostajati, nazadovatito make a stand — zaustaviti se, postaviti se v bran (vojska)to make a clean sweep of — dobro pomesti, vse odstranitito make a touch — sposoditi si, poskušati si sposoditito make hacks for — odpraviti se kam, napotiti seAmerican to make the team — biti sprejet v moštvoto make a trial of — poskusiti, preizkusiti kajto make o.s. understood — jasno se izrazitito make way — utreti si pot, napredovatito make s.o. out of his wits — spraviti koga ob pamet -
17 Eastman, George
SUBJECT AREA: Photography, film and optics[br]b. 12 July 1854 Waterville, New York, USAd. 14 March 1932 Rochester, New York, USA[br]American industrialist and pioneer of popular photography.[br]The young Eastman was a clerk-bookkeeper in the Rochester Savings Bank when in 1877 he took up photography. Taking lessons in the wet-plate process, he became an enthusiastic amateur photographer. However, the cumbersome equipment and noxious chemicals used in the process proved an obstacle, as he said, "It seemed to be that one ought to be able to carry less than a pack-horse load." Then he came across an account of the new gelatine dry-plate process in the British Journal of Photography of March 1878. He experimented in coating glass plates with the new emulsions, and was soon so successful that he decided to go into commercial manufacture. He devised a machine to simplify the coating of the plates, and travelled to England in July 1879 to patent it. In April 1880 he prepared to begin manufacture in a rented building in Rochester, and contacted the leading American photographic supply house, E. \& H.T.Anthony, offering them an option as agents. A local whip manufacturer, Henry A.Strong, invested $1,000 in the enterprise and the Eastman Dry Plate Company was formed on 1 January 1881. Still working at the Savings Bank, he ran the business in his spare time, and demand grew for the quality product he was producing. The fledgling company survived a near disaster in 1882 when the quality of the emulsions dropped alarmingly. Eastman later discovered this was due to impurities in the gelatine used, and this led him to test all raw materials rigorously for quality. In 1884 the company became a corporation, the Eastman Dry Plate \& Film Company, and a new product was announced. Mindful of his desire to simplify photography, Eastman, with a camera maker, William H.Walker, designed a roll-holder in which the heavy glass plates were replaced by a roll of emulsion-coated paper. The holders were made in sizes suitable for most plate cameras. Eastman designed and patented a coating machine for the large-scale production of the paper film, bringing costs down dramatically, the roll-holders were acclaimed by photographers worldwide, and prizes and medals were awarded, but Eastman was still not satisfied. The next step was to incorporate the roll-holder in a smaller, hand-held camera. His first successful design was launched in June 1888: the Kodak camera. A small box camera, it held enough paper film for 100 circular exposures, and was bought ready-loaded. After the film had been exposed, the camera was returned to Eastman's factory, where the film was removed, processed and printed, and the camera reloaded. This developing and printing service was the most revolutionary part of his invention, since at that time photographers were expected to process their own photographs, which required access to a darkroom and appropriate chemicals. The Kodak camera put photography into the hands of the countless thousands who wanted photographs without complications. Eastman's marketing slogan neatly summed up the advantage: "You Press the Button, We Do the Rest." The Kodak camera was the last product in the design of which Eastman was personally involved. His company was growing rapidly, and he recruited the most talented scientists and technicians available. New products emerged regularly—notably the first commercially produced celluloid roll film for the Kodak cameras in July 1889; this material made possible the introduction of cinematography a few years later. Eastman's philosophy of simplifying photography and reducing its costs continued to influence products: for example, the introduction of the one dollar, or five shilling, Brownie camera in 1900, which put photography in the hands of almost everyone. Over the years the Eastman Kodak Company, as it now was, grew into a giant multinational corporation with manufacturing and marketing organizations throughout the world. Eastman continued to guide the company; he pursued an enlightened policy of employee welfare and profit sharing decades before this was common in industry. He made massive donations to many concerns, notably the Massachusetts Institute of Technology, and supported schemes for the education of black people, dental welfare, calendar reform, music and many other causes, he withdrew from the day-to-day control of the company in 1925, and at last had time for recreation. On 14 March 1932, suffering from a painful terminal cancer and after tidying up his affairs, he shot himself through the heart, leaving a note: "To my friends: My work is done. Why wait?" Although Eastman's technical innovations were made mostly at the beginning of his career, the organization which he founded and guided in its formative years was responsible for many of the major advances in photography over the years.[br]Further ReadingC.Ackerman, 1929, George Eastman, Cambridge, Mass.B.Coe, 1973, George Eastman and the Early Photographers, London.BC -
18 Tesla, Nikola
SUBJECT AREA: Electricity[br]b. 9 July 1856 Smiljan, Croatiad. 7 January 1943 New York, USA[br]Serbian (naturalized American) engineer and inventor of polyphase electrical power systems.[br]While at the technical institute in Graz, Austria, Tesla's attention was drawn to the desirability of constructing a motor without a commutator. He considered the sparking between the commutator and brushes of the Gramme machine when run as a motor a serious defect. In 1881 he went to Budapest to work on the telegraph system and while there conceived the principle of the rotating magnetic field, upon which all polyphase induction motors are based. In 1882 Tesla moved to Paris and joined the Continental Edison Company. After building a prototype of his motor he emigrated to the United States in 1884, becoming an American citizen in 1889. He left Edison and founded an independent concern, the Tesla Electric Company, to develop his inventions.The importance of Tesla's first patents, granted in 1888 for alternating-current machines, cannot be over-emphasized. They covered a complete polyphase system including an alternator and induction motor. Other patents included the polyphase transformer, synchronous motor and the star connection of three-phase machines. These were to become the basis of the whole of the modern electric power industry. The Westinghouse company purchased the patents and marketed Tesla motors, obtaining in 1893 the contract for the Niagara Falls two-phase alternators driven by 5,000 hp (3,700 kW) water turbines.After a short period with Westinghouse, Tesla resigned to continue his research into high-frequency and high-voltage phenomena using the Tesla coil, an air-cored transformer. He lectured in America and Europe on his high-frequency devices, enjoying a considerable international reputation. The name "tesla" has been given to the SI unit of magnetic-flux density. The induction motor became one of the greatest advances in the industrial application of electricity. A claim for priority of invention of the induction motor was made by protagonists of Galileo Ferraris (1847–1897), whose discovery of rotating magnetic fields produced by alternating currents was made independently of Tesla's. Ferraris demonstrated the phenomenon but neglected its exploitation to produce a practical motor. Tesla himself failed to reap more than a small return on his work and later became more interested in scientific achievement than commercial success, with his patents being infringed on a wide scale.[br]Principal Honours and DistinctionsAmerican Institute of Electrical Engineers Edison Medal 1917. Tesla received doctorates from fourteen universities.Bibliography1 May 1888, American patent no. 381,968 (initial patent for the three-phase induction motor).1956, Nikola Tesla, 1856–1943, Lectures, Patents, Articles, ed. L.I.Anderson, Belgrade (selected works, in English).1977, My Inventions, repub. Zagreb (autobiography).Further ReadingM.Cheney, 1981, Tesla: Man Out of Time, New Jersey (a full biography). C.Mackechnie Jarvis, 1969, in IEE Electronics and Power 15:436–40 (a brief treatment).T.C.Martin, 1894, The Inventions, Researches and Writings of Nikola Tesla, New York (covers his early work on polyphase systems).GW
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