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41 insurance
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42 Porter, Charles Talbot
SUBJECT AREA: Steam and internal combustion engines[br]b. 18 January 1826 Auburn, New York, USAd. 1910 USA[br]American inventor of a stone dressing machine, an improved centrifugal governor and a high-speed steam engine.[br]Porter graduated from Hamilton College, New York, in 1845, read law in his father's office, and in the autumn of 1847 was admitted to the Bar. He practised for six or seven years in Rochester, New York, and then in New York City. He was drawn into engineering when aged about 30, first through a client who claimed to have invented a revolutionary type of engine and offered Porter the rights to it as payment of a debt. Having lent more money, Porter saw neither the man nor the engine again. Porter followed this with a similar experience over a patent for a stone dressing machine, except this time the machine was built. It proved to be a failure, but Porter set about redesigning it and found that it was vastly improved when it ran faster. His improved machine went into production. It was while trying to get the steam engine that drove the stone dressing machine to run more smoothly that he made a discovery that formed the basis for his subsequent work.Porter took the ordinary Watt centrifugal governor and increased the speed by a factor of about ten; although he had to reduce the size of the weights, he gained a motion that was powerful. To make the device sufficiently responsive at the right speed, he balanced the centrifugal forces by a counterweight. This prevented the weights flying outwards until the optimum speed was reached, so that the steam valves remained fully open until that point and then the weights reacted more quickly to variations in speed. He took out a patent in 1858, and its importance was quickly recognized. At first he manufactured and sold the governors himself in a specially equipped factory, because this was the only way he felt he could get sufficient accuracy to ensure a perfect action. For marine use, the counterweight was replaced by a spring.Higher speed had brought the advantage of smoother running and so he thought that the same principles could be applied to the steam engine itself, but it was to take extensive design modifications over several years before his vision was realized. In the winter of 1860–1, J.F. Allen met Porter and sketched out his idea of a new type of steam inlet valve. Porter saw the potential of this for his high-speed engine and Allen took out patents for it in 1862. The valves were driven by a new valve gear designed by Pius Fink. Porter decided to display his engine at the International Exhibition in London in 1862, but it had to be assembled on site because the parts were finished in America only just in time to be shipped to meet the deadline. Running at 150 rpm, the engine caused a sensation, but as it was non-condensing there were few orders. Porter added condensing apparatus and, after the failure of Ormerod Grierson \& Co., entered into an agreement with Joseph Whitworth to build the engines. Four were exhibited at the 1867 Paris Exposition Universelle, but Whitworth and Porter fell out and in 1868 Porter returned to America.Porter established another factory to build his engine in America, but he ran into all sorts of difficulties, both mechanical and financial. Some engines were built, and serious production was started c. 1874, but again there were further problems and Porter had to leave his firm. High-speed engines based on his designs continued to be made until after 1907 by the Southwark Foundry and Machine Company, Philadelphia, so Porter's ideas were proved viable and led to many other high-speed designs.[br]Bibliography1908, Engineering Reminiscences, New York: J. Wiley \& Sons; reprinted 1985, Bradley, Ill.: Lindsay (autobiography; the main source of information about his life).Further ReadingR.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (examines his governor and steam engine).O.Mayr, 1974, "Yankee practice and engineering theory; Charles T.Porter and the dynamics of the high-speed engine", Technology and Culture 16 (4) (examines his governor and steam engine).RLH -
43 year
[jə:]accounting year отчетный год accounting year финансовый год amount carried forward to next year сумма, перенесенная на следующий год assessment year год налогообложения balance from the previous year сальдо с предыдущего года banking year отчетный год банка base year базисный год basis year базисный год budget year бюджетный год budgetary year бюджетный год business year бюджетный год business year отчетный год business year хозяйственный год calendar year календарный год convention year пат. конвенционный год corporation tax year налоговый год корпорации current year текущий год end year последний год every other year через год every second year каждый второй год financial tax year финансовый год в системе налогообложения following year следующий год from year to year, year by year, year after year с каждым годом; каждый год; год от году good year благоприятный год grain year сельскохозяйственный год half year полгода new year Новый год; Happy New Year! с Новым годом! year pl возраст, годы; he looks young for his years он молодо выглядит для своих лет; in years пожилой in the year of grace (или of our Lord) 1975 в 1975 году от рождества Христова year pl возраст, годы; he looks young for his years он молодо выглядит для своих лет; in years пожилой income tax year год, за который взимается подоходный налог insurance year год страхования legal year юридический год maturity year год, когда наступает срок платежа new year новогодний; new year party встреча Нового года new year Новый год; Happy New Year! с Новым годом! new year новогодний; new year party встреча Нового года noncalendar financial year некалендарный финансовый год operating year операционный год parliamentary year парламентский год past year прошлый год patent year год выдачи патента preceding financial year предыдущий финансовый год preceding year предыдущий год previous year предшествующий год previous year предыдущий год probationary year испытательный год probationary year испытательный срок продолжительностью один год recession year кризисный год reporting year отчетный год reversion year год возврата salary year расчетный год по заработной плате sales year год продажи school year учебный год short business year короткий финансовый год short business year короткий хозяйственный год short fiscal year короткий финансовый год shortfall year год спада производства subsequent year последующий год tax year учетный год налогообложения taxation year учетный год налогоообложения trading year операционный год trading year хозяйственный год transitional fiscal year финансовый год переходного периода wage year год начисления заработной платы work year производственный год work year хозяйственный год from year to year, year by year, year after year с каждым годом; каждый год; год от году year год; year by year каждый год; year in year out из года в год year by year каждый год from year to year, year by year, year after year с каждым годом; каждый год; год от году year год; year by year каждый год; year in year out из года в год year of acceptance год акцептования year of acquisition год приобретения year of appropriation год ассигнования year of appropriation год приобретения year of assessment год обложения налогом year of assessment год оценки недвижимого имущества year of crisis кризисный год year of death год смерти year of deduction год предоставления налоговой скидки year of deduction год удержания year of delivery год поставки year of deposit год депонирования year of disbursement год выплаты year of foundation год основания year of grace год нашей эры years (and years) ago очень давно, целую вечность; the year of grace год нашей эры year of improvements год мелиорации year of improvements год модернизации year of income год получения дохода year of operation год сделки year of operation год финансовой операции year of payment год платежа year of provision год снабжения year of publication год публикации year of purchase год покупки year of rebuilding год реконструкции year of recession год спада year of sale год продажи year of sale год реализации year of termination год истечения срока year of termination срок прекращения действия year on year в годовом исчислении year to date на данный год year to the first instant год первоначального намерения years (and years) ago очень давно, целую вечность; the year of grace год нашей эры
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