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He is a retired schoolteacher

  • 1 retired

    مُتَقَاعِد \ retired: no longer working: He is a retired schoolteacher. \ مُحَال إلى المَعَاش \ retired: no longer working: He is a retired schoolteacher.

    Arabic-English glossary > retired

  • 2 متقاعد

    مُتَقَاعِد \ retired: no longer working: He is a retired schoolteacher.

    Arabic-English dictionary > متقاعد

  • 3 محال

    مُحَال \ out of the question: impossible: For the poor, holidays abroad are out of the question. \ مُحَال إلى المَعَاش \ retired: no longer working: He is a retired schoolteacher.

    Arabic-English dictionary > محال

  • 4 Petzval, Josef Max

    [br]
    b. 1807 Spisska-Beila, Hungary
    d. 17 September 1891 Vienna, Austria
    [br]
    Hungarian mathematician and photographic-lens designer, inventor of the first "rapid" portrait lens.
    [br]
    Although born in Hungary, Petzval was the son of German schoolteacher. He studied engineering at the University of Budapest and after graduation was appointed to the staff as a lecturer. In 1835 he became the University's Professor of Higher Mathematics. Within a year he was offered a similar position at the more prestigious University of Vienna, a chair he was to occupy until 1884.
    The earliest photographic cameras were fitted with lenses originally designed for other optical instruments. All were characterized by small apertures, and the long exposures required by the early process were in part due to the "slow" lenses. As early as 1839, Petzval began calculations with the idea of producing a fast achromatic objective for photographic work. For technical advice he turned to the Viennese optician Peter Voigtländer, who went on to make the first Petzval portrait lens in 1840. It had a short focal length but an extremely large aperture for the day, enabling exposure times to be reduced to at least one tenth of that required with other contemporary lenses. The Petzval portrait lens was to become the basic design for years to come and was probably the single most important development in making portrait photography possible; by capturing public imagination, portrait photography was to drive photographic innovation during the early years.
    Petzval later fell out with Voigtländer and severed his connection with the company in 1845. When Petzval was encouraged to design a landscape lens in the 1850s, the work was entrusted to another Viennese optician, Dietzler. Using some early calculations by Petzval, Voigtländer was able to produce a similar lens, which he marketed in competition, and an acrimonious dispute ensued. Petzval, embittered by the quarrel and depressed by a burglary which destroyed years of records of his optical work, abandoned optics completely in 1862 and devoted himself to acoustics. He retired from his professorship on his seventieth birthday, respected by his colleagues but unloved, and lived the life of a recluse until his death.
    [br]
    Principal Honours and Distinctions
    Member of the Hungarian Academy of Science 1873.
    Further Reading
    J.M.Eder, 1945, History of Photography, trans. E. Epstean, New York (provides details of Petzval's life and work; Eder claims he was introduced to Petzval by mutual friends and succeeded in obtaining personal data).
    Rudolf Kingslake, 1989, A History of the Photographic Lens, Boston (brief biographical details).
    L.W.Sipley, 1965, Photography's Great Inventors, Philadelphia (brief biographical details).
    JW

    Biographical history of technology > Petzval, Josef Max

  • 5 Reynolds, Osborne

    [br]
    b. 23 April 1842 Belfast, Ireland
    d. 1912 Watchet, Somerset, England
    [br]
    English engineer and educator.
    [br]
    Osborne Reynolds's father, a clergyman and schoolteacher, had been a Fellow of Queens' College, Cambridge; it was to Queens' that the young Reynolds went to study mathematics, graduating as 7th Wrangler in 1867, and going on in his turn to become a Fellow of the College. Reynolds had developed an interest in practical applications of physics and engineering, and for a short time he entered the office of the London civil engineers Lawson and Mansergh. In 1868 he was appointed to the new Chair of Engineering at Owens College, Manchester, and he remained in this post for thirty-seven years, until he retired in 1905. During this period he presided over a department that grew steadily in size and reputation, and undertook prolonged research projects into phenomena such as lubrication, the laws governing the flow of water in pipes, turbulence and other physical features with practical applications. He was elected a Fellow of the Royal Society in 1877, being nominated Royal Medallist in 1888. In 1883 he became a Member of the Institution of Civil Engineers, and in 1885 he was awarded the Telford Premium of the Institution. He served as Secretary of the Manchester Literary and Philosophical Society from 1874 to 1883, and was appointed President in 1888–9 and Dalton Medallist in 1903. He was President of Section G of the British Association for the History of Science in 1887, and in 1884 he received the degree of LLD from Glasgow University. Among his many students at Owens College was J.J. (later Sir Joseph) Thomson (1856–1940), who entered the college in 1871. Reynolds's collected scientific papers were published in 1900–3.
    [br]
    Principal Honours and Distinctions
    FRS 1877. Institution of Civil Engineers Telford Premium 1885. President, Manchester Literary and Philosophical Society 1888–9. Manchester Literary and Philosophical Society, Dalton Medal 1903.
    Further Reading
    Dictionary of National Biography Supplement.
    D.M.McDowell and J.D.Jackson (eds), 1970, Osborne Reynolds and Engineering Science Today, Manchester: Manchester University Press.
    AB

    Biographical history of technology > Reynolds, Osborne

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