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  • 41 Boole, George

    [br]
    b. 2 November 1815 Lincoln, England
    d. 8 December 1864 Ballintemple, Coounty Cork, Ireland
    [br]
    English mathematician whose development of symbolic logic laid the foundations for the operating principles of modern computers.
    [br]
    Boole was the son of a tradesman, from whom he learned the principles of mathematics and optical-component manufacturing. From the early age of 16 he taught in a number of schools in West Yorkshire, and when only 20 he opened his own school in Lincoln. There, at the Mechanical Institute, he avidly read mathematical journals and the works of great mathematicians such as Lagrange, Laplace and Newton and began to tackle a variety of algebraic problems. This led to the publication of a constant stream of original papers in the newly launched Cambridge Mathematical Journal on topics in the fields of algebra and calculus, for which in 1844 he received the Royal Society Medal.
    In 1847 he wrote The Mathematical Analysis of Logic, which applied algebraic symbolism to logical forms, whereby the presence or absence of properties could be represented by binary states and combined, just like normal algebraic equations, to derive logical statements about a series of operations. This laid the foundations for the binary logic used in modern computers, which, being based on binary on-off devices, greatly depend on the use of such operations as "and", "nand" ("not and"), "or" and "nor" ("not or"), etc. Although he lacked any formal degree, this revolutionary work led to his appointment in 1849 to the Chair of Mathematics at Queen's College, Cork, where he continued his work on logic and also produce treatises on differential equations and the calculus of finite differences.
    [br]
    Principal Honours and Distinctions
    Royal Society Medal 1844. FRS 1857.
    Bibliography
    Boole's major contributions to logic available in republished form include George Boole: Investigation of the Laws of Thought, Dover Publications; George Boole: Laws of Thought, Open Court, and George Boole: Studies in Logic \& Probability, Open Court.
    1872, A Treatise on Differential Equations.
    Further Reading
    W.Kneale, 1948, "Boole and the revival of logic", Mind 57:149.
    G.C.Smith (ed.), 1982, George Boole \& Augustus de Morgan. Correspondence 1842– 1864, Oxford University Press.
    —, 1985, George Boole: His Life and Work, McHale.
    E.T.Bell, 1937, Men of Mathematics, London: Victor Gollancz.
    KF

    Biographical history of technology > Boole, George

  • 42 Clerk, Sir Dugald

    [br]
    b. 31 March 1854 Glasgow, Scotland
    d. 12 November 1932 Ewhurst, Surrey, England
    [br]
    Scottish mechanical engineer, inventor of the two-stroke internal combustion engine.
    [br]
    Clerk began his engineering training at about the age of 15 in the drawing office of H.O.Robinson \& Company, Glasgow, and in his father's works. Meanwhile, he studied at the West of Scotland Technical College and then, from 1871 to 1876, at Anderson's College, Glasgow, and at the Yorkshire College of Science, Leeds. Here he worked under and then became assistant to the distinguished chemist T.E.Thorpe, who set him to work on the fractional distillation of petroleum, which was to be useful to him in his later work. At that time he had intended to become a chemical engineer, but seeing a Lenoir gas engine at work, after his return to Glasgow, turned his main interest to gas and other internal combustion engines. He pursued his investigations first at Thomson, Sterne \& Company (1877–85) and then at Tangyes of Birmingham (1886–88. In 1888 he began a lifelong partnership in Marks and Clerk, consulting engineers and patent agents, in London.
    Beginning his work on gas engines in 1876, he achieved two patents in the two following years. In 1878 he made his principal invention, patented in 1881, of an engine working on the two-stroke cycle, in which the piston is powered during each revolution of the crankshaft, instead of alternate revolutions as in the Otto four-stroke cycle. In this engine, Clerk introduced supercharging, or increasing the pressure of the air intake. Many engines of the Clerk type were made but their popularity waned after the patent for the Otto engine expired in 1890. Interest was later revived, particularly for application to large gas engines, but Clerk's engine eventually came into its own where simple, low-power motors are needed, such as in motor cycles or motor mowers.
    Clerk's work on the theory and design of gas engines bore fruit in the book The Gas Engine (1886), republished with an extended text in 1909 as The Gas, Petrol and Oil Engine; these and a number of papers in scientific journals won him international renown. During and after the First World War, Clerk widened the scope of his interests and served, often as chairman, on many bodies in the field of science and industry.
    [br]
    Principal Honours and Distinctions
    Knighted 1917; FRS 1908; Royal Society Royal Medal 1924; Royal Society of Arts Alber Medal 1922.
    Further Reading
    Obituary Notices of Fellows of the Royal Society, no. 2, 1933.
    LRD

    Biographical history of technology > Clerk, Sir Dugald

  • 43 Corliss, George Henry

    [br]
    b. 2 June 1817 Easton, Washington City, New York, USA
    d. 21 February 1888 USA
    [br]
    American inventor of a cut-off mechanism linked to the governor which revolutionized the operation of steam engines.
    [br]
    Corliss's father was a physician and surgeon. The son was educated at Greenwich, New York, but while he showed an aptitude for mathematics and mechanics he first of all became a storekeeper and then clerk, bookkeeper, salesperson and official measurer and inspector of the cloth produced at W.Mowbray \& Son. He went to the Castleton Academy, Vermont, for three years and at the age of 21 returned to a store of his own in Greenwich. Complaints about stitching in the boots he sold led him to patent a sewing machine. He approached Fairbanks, Bancroft \& Co., Providence, Rhode Island, machine and steam engine builders, about producing his machine, but they agreed to take him on as a draughtsman providing he abandoned it. Corliss moved to Providence with his family and soon revolutionized the design and construction of steam engines. Although he started working out ideas for his engine in 1846 and completed one in 1848 for the Providence Dyeing, Bleaching and Calendering Company, it was not until March 1849 that he obtained a patent. By that time he had joined John Barstow and E.J.Nightingale to form a new company, Corliss Nightingale \& Co., to build his design of steam-engines. He used paired valves, two inlet and two exhaust, placed on opposite sides of the cylinder, which gave good thermal properties in the flow of steam. His wrist-plate operating mechanism gave quick opening and his trip mechanism allowed the governor to regulate the closure of the inlet valve, giving maximum expansion for any load. It has been claimed that Corliss should rank equally with James Watt in the development of the steam-engine. The new company bought land in Providence for a factory which was completed in 1856 when the Corliss Engine Company was incorporated. Corliss directed the business activities as well as technical improvements. He took out further patents modifying his valve gear in 1851, 1852, 1859, 1867, 1875, 1880. The business grew until well over 1,000 workers were employed. The cylindrical oscillating valve normally associated with the Corliss engine did not make its appearance until 1850 and was included in the 1859 patent. The impressive beam engine designed for the 1876 Centennial Exhibition by E. Reynolds was the product of Corliss's works. Corliss also patented gear-cutting machines, boilers, condensing apparatus and a pumping engine for waterworks. While having little interest in politics, he represented North Providence in the General Assembly of Rhode Island between 1868 and 1870.
    [br]
    Further Reading
    Many obituaries appeared in engineering journals at the time of his death. Dictionary of American Biography, 1930, Vol. IV, New York: C.Scribner's Sons. R.L.Hills, 1989, Power from Steam. A History of the Stationary Steam Engine, Cambridge University Press (explains Corliss's development of his valve gear).
    J.L.Wood, 1980–1, "The introduction of the Corliss engine to Britain", Transactions of the Newcomen Society 52 (provides an account of the introduction of his valve gear to Britain).
    W.H.Uhland, 1879, Corliss Engines and Allied Steam-motors, London: E. \& F.N.Spon.
    RLH

    Biographical history of technology > Corliss, George Henry

  • 44 Daguerre, Louis Jacques Mandé

    [br]
    b. 18 November 1787 Carmeilles-en-Parisis, France
    d. 10 July 1851 Petit-Bry-sur-Marne, France
    [br]
    French inventor of the first practicable photographic process.
    [br]
    The son of a minor official in a magistrate's court, Daguerre showed an early aptitude for drawing. He was first apprenticed to an architect, but in 1804 he moved to Paris to learn the art of stage design. He was particularly interested in perspective and lighting, and later showed great ingenuity in lighting stage sets. Fascinated by a popular form of entertainment of the period, the panorama, he went on to create a variant of it called the diorama. It is assumed that he used a camera obscura for perspective drawings and, by purchasing it from the optician Chevalier, he made contact with Joseph Nicéphore Niepce. In 1829 Niepce and Daguerre entered into a formal partnership to perfect Niepce's heliographic process, but the partnership was dissolved when Niepce died in 1833, when only limited progress had been made. Daguerre continued experimenting alone, however, using iodine and silver plates; by 1837 he had discovered that images formed in the camera obscura could be developed by mercury vapour and fixed with a hot salt solution. After unsuccessfully attempting to sell his process, Daguerre approached F.J.D. Arago, of the Académie des Sciences, who announced the discovery in 1839. Details of Daguerre's work were not published until August of that year when the process was presented free to the world, except England. With considerable business acumen, Daguerre had quietly patented the process through an agent, Miles Berry, in London a few days earlier. He also granted a monopoly to make and sell his camera to a Monsieur Giroux, a stationer by trade who happened to be a relation of Daguerre's wife. The daguerreotype process caused a sensation when announced. Daguerre was granted a pension by a grateful government and honours were showered upon him all over the world. It was a direct positive process on silvered copper plates and, in fact, proved to be a technological dead end. The future was to lie with negative-positive photography devised by Daguerre's British contemporary, W.H.F. Talbot, although Daguerre's was the first practicable photographic process to be announced. It captured the public's imagination and in an improved form was to dominate professional photographic practice for more than a decade.
    [br]
    Principal Honours and Distinctions
    Officier de la Légion d'honneur 1839. Honorary FRS 1839. Honorary Fellow of the National Academy of Design, New York, 1839. Honorary Fellow of the Vienna Academy 1843. Pour le Mérite, bestowed by Frederick William IV of Prussia, 1843.
    Bibliography
    14 August 1839, British patent no. 8,194 (daguerrotype photographic process).
    The announcement and details of Daguerre's invention were published in both serious and popular English journals. See, for example, 1839 publications of Athenaeum, Literary Gazette, Magazine of Science and Mechanics Magazine.
    Further Reading
    H.Gernsheim and A.Gernsheim, 1956, L.J.M. Daguerre (the standard account of Daguerre's work).
    —1969, The History of Photography, rev. edn, London (a very full account).
    J.M.Eder, 1945, History of Photography, trans. E. Epstean, New York (a very full account).
    JW

    Biographical history of technology > Daguerre, Louis Jacques Mandé

  • 45 Lawes, Sir John Bennet

    [br]
    b. 28 December 1814 Rothamsted, Hertfordshire, England
    d. 31 August 1900 Rothamsted, Hertfordshire, England
    [br]
    English scientific agriculturalist.
    [br]
    Lawes's education at Eton and Oxford did little to inform his early taste for chemistry, which he developed largely on his own. By the age of 20 he had fitted up the best bedroom in his house as a fully equipped chemical laboratory. His first interest was in the making of drugs; it was said that he knew the Pharmacopoeia, by heart. He did, however, receive some instruction from Anthony Todd Thomson of University College, London. His father having died in 1822, Lawes entered into possession of the Rothamsted estate when he came of age in 1834. He began experiments with plants with uses as drugs, but following an observation by a neighbouring farmer of the effect of bones on the growth of certain crops Lawes turned to experiments with bones dissolved in sulphuric acid on his turnip crop. The results were so promising that he took out a patent in 1842 for converting mineral and fossil phosphates into a powerful manure by the action of sulphuric acid. The manufacture of these superphosphates became a major industry of tremendous benefit to agriculture. Lawes himself set up a factory at Deptford in 1842 and a larger one in 1857 at Barking Creek, both near London. The profits from these and other chemical manufacturing concerns earned Lawes profits which funded his experimental work at Rothamsted. In 1843, Lawes set up the world's first agricultural experiment station. Later in the same year he was joined by Joseph Henry Gilbert, and together they carried out a considerable number of experiments of great benefit to agriculture, many of the results of which were published in the leading scientific journals of the day, including the Philosophical Transactions of the Royal Society. In all, 132 papers were published, most of them jointly with Gilbert. A main theme of the work on plants was the effect of various chemical fertilizers on the growth of different crops, compared with the effects of farm manure and of no treatment at all. On animal rearing, they studied particularly the economical feeding of animals.
    The work at Rothamsted soon brought Lawes into prominence; he joined the Royal Agricultural Society in 1846 and became a member of its governing body two years later, a position he retained for over fifty years. Numerous distinctions followed and Rothamsted became a place of pilgrimage for people from many parts of the world who were concerned with the application of science to agriculture. Rothamsted's jubilee in 1893 was marked by a public commemoration headed by the Prince of Wales.
    [br]
    Principal Honours and Distinctions
    Baronet 1882. FRS 1854. Royal Society Royal Medal (jointly with Gilbert) 1867.
    Further Reading
    Memoir with portrait published in J. Roy. Agric. Soc. Memoranda of the origin, plan and results of the field and other experiments at Rothamsted, issued annually by the Lawes Agricultural Trust Committee, with a list of Lawes's scientific papers.
    LRD

    Biographical history of technology > Lawes, Sir John Bennet

  • 46 Pötsch, Friedrich Hermann

    [br]
    b. 12 December 1842 Biendorf, near Köthen, Germany
    d. 9 June 1902 Dresden, Germany
    [br]
    German mine surveyor, inventor of the freezing process for sinking shafts.
    [br]
    Pötsch was the son of a forest officer and could not easily attend school, with the consequences that it took him a long time to obtain the scholarly education needed to enable him to begin work on a higher level with the mining administration in the duchy of Anhalt in 1868. Seven years later, he was licensed as a Prussian mining surveyor and in this capacity he worked with the mining inspectorate of Aschersleben. During that time he frequently came across shafts for brown-coal mines which had been sunk down to watery strata but then had to be abandoned. His solution to the problem was to freeze the quicksand with a solution of chloride; this was better than the previous attempts in England to instal cooling coils at the bottom of the shaft. Pötsch's conception implied the construction of ice walls with the means of boreholes and refrigerators. By his method a set of boreholes was driven through the watery strata, the smaller pipes contained within the main bore pipes, providing a channel through which calcium chloride was pumped, returning through the longer pipe until the ground was frozen solid. He obtained a patent in 1883 and many leading international journals reported on the method the same year.
    In 1884 he established the Internationale Gesselschaft für Schacht-, Brucken-und Tunnelbau in Magdeburg and he also became Director of the Poetsch-Sooy-Smith Freezing Company in New Jersey, which constructed the first freezing shaft in America in 1888.
    However, Pötsch was successful only for a short period of time and, being a clumsy entrepreneur, he had to dissolve his company in 1894. Unfortunately, his decision to carry out the complete shaft-sinking business did not allow him to concentrate on solving upcoming technical problems of his new process. It was Louis Gebhardt (1861–1924), his former engineer, who took care of development, especially in co-operation with French mining engineers, and thus provided the basis for the freezing process becoming widely used for shaft-sinking in complicated strata ever since.
    [br]
    Bibliography
    1886, Das Gefrierverfahren. Methode für schnelles, sicheres und lotrechtes Abteufen von Schächten im Schwimmsande und uberhaupt im wasserreichen Gebirge; für Herstellung tiefgehender Bruckenpfeiler und für TunnelBauten in rolligem und schwimmendem Gebirge, Freiberg.
    1889, Geschichtliches über die Entstehung und Herausbildung des Gefrierverfahrens, Magdeburg.
    1895, Das Gefrierverfahren und das kombinierte Schachtabbohr-und Gefrierverfahren (Patent Pötsch), Freiberg.
    Further Reading
    D.Hoffmann, 1962, AchtJahrzehnte Gefrierverfahren nach Putsch, Essen: Glückauf (the most substantial biography; also covers technological aspects).
    G.Gach, 1986, In Schacht und Strecke, Essen: Glückauf, pp. 31–53 (provides information on the development of specialized mining companies in Germany originating in the freezing process).
    WK

    Biographical history of technology > Pötsch, Friedrich Hermann

  • 47 Scheutz, George

    [br]
    b. 23 September 1785 Jonkoping, Sweden
    d. 27 May 1873 Stockholm, Sweden
    [br]
    Swedish lawyer, journalist and self-taught engineer who, with his son Edvard Raphael Scheutz (b. 13 September 1821 Stockholm, Sweden; d. 28 January 1881 Stockholm, Sweden) constructed a version of the Babbage Difference Engine.
    [br]
    After early education at the Jonkoping elementary school and the Weixo Gymnasium, George Scheutz entered the University of Lund, gaining a degree in law in 1805. Following five years' legal work, he moved to Stockholm in 1811 to work at the Supreme Court and, in 1814, as a military auditor. In 1816, he resigned, bought a printing business and became editor of a succession of industrial and technical journals, during which time he made inventions relating to the press. It was in 1830 that he learned from the Edinburgh Review of Babbage's ideas for a difference engine and started to make one from wood, pasteboard and wire. In 1837 his 15-yearold student son, Edvard Raphael Scheutz, offered to make it in metal, and by 1840 they had a working machine with two five-digit registers, which they increased the following year and then added a printer. Obtaining a government grant in 1851, by 1853 they had a fully working machine, now known as Swedish Difference Engine No. 1, which with an experienced operator could generate 120 lines of tables per hour and was used to calculate the logarithms of the numbers 1 to 10,000 in under eighty hours. This was exhibited in London and then at the Paris Great Exhibition, where it won the Gold Medal. It was subsequently sold to the Dudley Observatory in Albany, New York, for US$5,000 and is now in a Chicago museum.
    In England, the British Registrar-General, wishing to produce new tables for insurance companies, and supported by the Astronomer Royal, arranged for government finance for construction of a second machine (Swedish Difference Engine No. 2). Comprising over 1,000 working parts and weighing 1,000 lb (450 kg), this machine was used to calculate over 600 tables. It is now in the Science Museum.
    [br]
    Principal Honours and Distinctions
    Member of the Swedish Academy of Sciences, Paris Exhibition Medal of Honour (jointly with Edvard) 1856. Annual pension of 1,200 marks per annum awarded by King Carl XV 1860.
    Bibliography
    1825, "Kranpunpar. George Scheutz's patent of 14 Nov 1825", Journal for Manufacturer och Hushallning 8.
    ellemême, Stockholm.
    Further Reading
    R.C.Archibald, 1947, "P.G.Scheutz, publicist, author, scientific mechanic and Edvard Scheutz, engineer. Biography and Bibliography", MTAC 238.
    U.C.Merzbach, 1977, "George Scheutz and the first printing calculator", Smithsonian
    Studies in History and Technology 36:73.
    M.Lindgren, 1990, Glory and Failure (the Difference Engines of Johan Muller, Charles Babbage and George \& Edvard Scheutz), Cambridge, Mass.: MIT Press.
    KF

    Biographical history of technology > Scheutz, George

  • 48 Stevenson, Robert

    [br]
    b. 8 June 1772 Glasgow, Scotland
    d. 12 July 1850 Edinburgh, Scotland
    [br]
    Scottish lighthouse designer and builder.
    [br]
    After his father's death when he was only 2 years old, Robert Stevenson was educated at a school for children from families in reduced circumstances. However, c. 1788 his mother married again, to Thomas Smith, Engineer to the Northern Lighthouse Board. Stevenson then served an apprenticeship under his new stepfather. The Board, which is still an active force in the 1990s, was founded in 1786 to oversee the lights and buoyage in some of the wildest waters in Western Europe, the seas around the coasts of Scotland and the Isle of Man.
    After studies at Andersen's College (now the University of Strathclyde) and later at Edinburgh University, Stevenson assumed responsibility in the field for much of the construction work sanctioned by the Board. After some years he succeeded Smith as Engineer to the Board and thereby the long connection between the Northern Lights and the Stevenson family commenced.
    Stevenson became Engineer to the Board when he was about 30 years old, remaining in that office for the best part of half a century. During these years he improved catoptric lighting, adopted the central lamp refracting system and invented the intermittent flashing light. While these developments were sufficient to form a just memorial to the man, he was involved in greater endeavours in the construction of around twenty lighthouses, most of which had ingenious forms of construction. The finest piece was the Bell Rock Lighthouse, built on a reef off the Scottish East Coast. This enterprise took five years to complete and can be regarded as the most important construction of his life.
    His interests fitted in with those of the other great men living in and around Edinburgh at the time, and included oceanography, astronomy, architecture and antiquarian studies. He designed several notable bridges, proposed a design for the rails for railways and also made a notable study of marine timber borers. He contributed to Encyclopaedia Britannica and to many journals.
    His grandson, born in the year of his death, was the famous author Robert Louis Stevenson (1850–94).
    [br]
    Principal Honours and Distinctions
    FRS Edinburgh.
    Further Reading
    Sir Walter Scott, 1982, Northern Lights, Hawick.
    FMW

    Biographical history of technology > Stevenson, Robert

  • 49 Williams, Sir Frederic Calland

    [br]
    b. 26 June 1911 Stockport, Cheshire, England
    d. 11 August 1977 Prestbury, Cheshire, England
    [br]
    English electrical engineer who invented the Williams storage cathode ray tube, which was extensively used worldwide as a data memory in the first digital computers.
    [br]
    Following education at Stockport Grammar School, Williams entered Manchester University in 1929, gaining his BSc in 1932 and MSc in 1933. After a short time as a college apprentice with Metropolitan Vickers, he went to Magdalen College, Oxford, to study for a DPhil, which he was awarded in 1936. He returned to Manchester University that year as an assistant lecturer, gaining his DSc in 1939. Following the outbreak of the Second World War he worked for the Scientific Civil Service, initially at the Bawdsey Research Station and then at the Telecommunications Research Establishment at Malvern, Worcestershire. There he was involved in research on non-incandescent amplifiers and diode rectifiers and the development of the first practical radar system capable of identifying friendly aircraft. Later in the war, he devised an automatic radar system suitable for use by fighter aircraft.
    After the war he resumed his academic career at Manchester, becoming Professor of Electrical Engineering and Director of the University Electrotechnical Laboratory in 1946. In the same year he succeeded in developing a data-memory device based on the cathode ray tube, in which the information was stored and read by electron-beam scanning of a charge-retaining target. The Williams storage tube, as it became known, not only found obvious later use as a means of storing single-frame, still television images but proved to be a vital component of the pioneering Manchester University MkI digital computer. Because it enabled both data and program instructions to be stored in the computer, it was soon used worldwide in the development of the early stored-program computers.
    [br]
    Principal Honours and Distinctions
    Knighted 1976. OBE 1945. CBE 1961. FRS 1950. Hon. DSc Durham 1964, Sussex 1971, Wales 1971. First Royal Society of Arts Benjamin Franklin Medal 1957. City of Philadelphia John Scott Award 1960. Royal Society Hughes Medal 1963. Institution of Electrical Engineers Faraday Medal 1972. Institute of Electrical and Electronics Engineers Pioneer Award 1973.
    Bibliography
    Williams contributed papers to many scientific journals, including Proceedings of the Royal Society, Proceedings of the Cambridge Philosophical Society, Journal of the Institution of Electrical Engineers, Proceedings of the Institution of Mechanical Engineers, Wireless Engineer, Post Office Electrical Engineers' Journal. Note especially: 1948, with J.Kilburn, "Electronic digital computers", Nature 162:487; 1949, with J.Kilburn, "A storage system for use with binary digital computing machines", Proceedings of the Institution of Electrical Engineers 96:81; 1975, "Early computers at Manchester University", Radio \& Electronic Engineer 45:327. Williams also collaborated in the writing of vols 19 and 20 of the MIT Radiation
    Laboratory Series.
    Further Reading
    B.Randell, 1973, The Origins of Digital Computers, Berlin: Springer-Verlag. M.R.Williams, 1985, A History of Computing Technology, London: Prentice-Hall. See also: Stibitz, George R.; Strachey, Christopher.
    KF

    Biographical history of technology > Williams, Sir Frederic Calland

  • 50 Wöhler, August

    SUBJECT AREA: Metallurgy
    [br]
    b. 22 June 1819 Soltau, Germany
    d. 21 June 1914 Hannover, Germany
    [br]
    German railway engineer who first established the fatigue fracture of metals.
    [br]
    Wöhler, the son of a schoolteacher, was born at Soltau on the Luneburg Heath and received his early education at his father's school, where his mathematical abilities soon became apparent. He completed his studies at the Technical High School, Hannover.
    In 1840 he obtained a position at the Borsig Engineering Works in Berlin and acquired there much valuable experience in railway technology. He trained as an engine driver in Belgium and in 1843 was appointed as an engineer to the first Hannoverian Railway, then being constructed between Hannover and Lehrte. In 1847 he became Chief Superintendent of rolling stock on the Lower Silesian-Brandenhurg Railway, where his technical abilities influenced the Prussian Minister of Commerce to appoint him to a commission set up to investigate the reasons for the unusually high incidence of axle failures then being encountered on the railways. This was in 1852, and by 1854, when the Brandenburg line had been nationalized, Wöhler had already embarked on the long, systematic programme of mechanical testing which eventually provided him with a clear insight into the process of what is now referred to as "fatigue failure". He concentrated initially on the behaviour of machined iron and steel specimens subjected to fluctuating direct, bending and torsional stresses that were imposed by testing machines of his own design.
    Although Wöhler was not the first investigator in this area, he was the first to recognize the state of "fatigue" induced in metals by the repeated application of cycles of stress at levels well below those that would cause immediate failure. His method of plotting the fatigue stress amplitude "S" against the number of stress cycles necessary to cause failure "N" yielded the well-known S-N curve which described very precisely the susceptibility to fatigue failure of the material concerned. Engineers were thus provided with an invaluable testing technique that is still widely used in the 1990s.
    Between 1851 and 1898 Wöhler published forty-two papers in German technical journals, although the importance of his work was not initially fully appreciated in other countries. A display of some of his fracture fatigue specimens at the Paris Exposition in 1867, however, stimulated a short review of his work in Engineering in London. Four years later, in 1871, Engineering published a series of nine articles which described Wöhler's findings in considerable detail and brought them to the attention of engineers. Wöhler became a member of the newly created management board of the Imperial German Railways in 1874, an appointment that he retained until 1889. He is also remembered for his derivation in 1855 of a formula for calculating the deflections under load of lattice girders, plate girders, and other continuous beams resting on more than two supports. This "Three Moments" theorem appeared two years before Clapeyron independently advanced the same expression. Wöhler's other major contribution to bridge design was to use rollers at one end to allow for thermal expansion and contraction.
    [br]
    Bibliography
    1855, "Theorie rechteckiger eiserner Brückenbalken", Zeitschrift für Bauwesen 5:122–66. 1870, "Über die Festigkeitversuche mit Eisen und Stahl", Zeitschrift für Bauwesen 20:73– 106.
    Wöhler's experiments on the fatigue of metals were reported in Engineering (1867) 2:160; (1871) 11:199–200, 222, 243–4, 261, 299–300, 326–7, 349–50, 397, 439–41.
    Further Reading
    R.Blaum, 1918, "August Wöhler", Beiträge zur Geschichte der Technik und Industrie 8:35–55.
    ——1925, "August Wöhler", Deutsches biographisches Jahrbuch, Vol. I, Stuttgart, pp. 103–7.
    K.Pearson, 1890, "On Wöhler's experiments on alternating stress", Messeng. Math.
    20:21–37.
    J.Gilchrist, 1900, "On Wöhler's Laws", Engineer 90:203–4.
    ASD

    Biographical history of technology > Wöhler, August

  • 51 Wollaston, William Hyde

    SUBJECT AREA: Metallurgy
    [br]
    b. 6 August 1766 East Dereham, Norfolk, England
    d. 22 December 1828 London, England
    [br]
    English chemist and metallurgist who discovered palladium and rhodium, pioneer in the fabrication of platinum.
    [br]
    Wollaston qualified in medicine at Cambridge University but gave up his practice in 1800 to devote himself to chemistry and metallurgy, funded from the profits from making malleable platinum. In partnership with Smithson Tennant, a friend from his Cambridge days, he worked on the extraction of platinum by dissolving it in aqua regia. In 1802 he found that in addition to platinum the solution contained a new metal, which he named palladium. Two years later he identified another new metal, rhodium.
    Wollaston developed a method of forming platinum by means of powder metallurgy and was the first to produce malleable and ductile platinum on a commercial scale. He produced platinum vessels for sulphuric acid manufacture and scientific apparatus such as crucibles. He devised an elegant method for forming fine platinum wire. He also applied his inventive talents to improving scientific apparatus, including the sextant and microscope and a reflecting goniometer for measuring crystal angles. In 1807 he was appointed Joint Secretary of the Royal Society with Sir Humphry Davy, which entailed a heavy workload and required them to referee all the papers submitted to the Society for publication.
    Wollaston's output of platinum began to decline after 1822. Due to ill health he ceased business operations in 1828 and at last made public the details of his secret platinum fabrication process. It was fully described in the Bakerian Lecture he delivered to the Royal Society on 28 November 1828, shortly before his death.
    [br]
    Principal Honours and Distinctions
    FRS 1793.
    Bibliography
    His scientific papers were published in various journals, nearly all listed in the Royal Society Catalogue of Scientific Papers.
    Further Reading
    There is no good general biography, the best general account being the entry in
    Dictionary of Scientific Biography.
    D.McDonald, 1960, A History of Platinum from the Earliest Times to the Eighteen- Eighties, London (provides a good discussion of his work on platinum).
    M.E.Weeks, 1939, "The discovery of the elements", Journal of Chemical Education: 184–5.
    ASD

    Biographical history of technology > Wollaston, William Hyde

  • 52 take

    [teik] v վերցնել, առնել. take a book from the library գրադարանից գիրք վերցնել. take the wheel ղեկին նստել (ղեկը բռնել). What journals do you take? Ի՞նչ ամսագիր եք բաժա նորդա գրվել. (բռնել, վերցնել, գրավել) take prisoners/ a town գերի վերցնել, քաղաք գրավել. take all the prizes բոլոր մրցանակները շահել. be taken by փխբ. տարվել մի բանով. He’s taken by the idea Նա շատ է տարված այդ մտքով. (ընդունել, ստանձնել) take smth seriously/ as a joke լուրջ ընդունել, ընդունել որպես կատակ. take in lodgers կենվորներ պահել. take an order պատվեր ընդունել. take one’s time չշտապել. take the news well/badly լուրը լավ/վատ ընդունել. take a walk զբոսանքի գնալ/զբոսնել. take smth in the wrong way սխալ հաս կանալ. take steps միջոցներ ձեռք առնել. take into consideration նկատի ունենալ. take pictures նկա րահանել. take the hint ակնարկը հաս կանալ. take the floor ձայն/խոսք վերցնել. take smn as he is ընդունել այնպիսին ինչպիսին կա. take advantage օգտվել. take the strain լարմանը դիմա նալ. take the upper hand հաղթող դուրս գալ. take a bath լոգանք ընդունել. take things easy չհուզ վել. take part մասնակցել. take smb’s side մեկի կողմը պահել. I took him for his brother Ես նրան իր եղբոր տեղը դրեցի/ընդունեցի. take shape ձևավորվել. take precautions նախազգու շական միջոցներ ձեռք առնել. take notes գրա ռումներ կատարել. take the risk համարձակ վել. take an opportunity առիթն օգտագործել. take an appeal բողոքարկել. take a verdict դատա վճիռ կայացնել. take evidence ապացույցներ ընդունել. (տանել, վարել) take to the doctor բժշկի տանել. The bus will take you Ավտոբուսը ձեզ կտանի. (գնալ) take a taxi/the bus/the train տաքսիով/ավտոբուսով/գնացքով գնալ. take a short cut կարճ ճանապարհով գնալ. all things taken together բոլորը միասին վերցրած, ընդհա նուր առմամբ. (ընդունել, խմել, ուտել) take medicine դեղ ընդունել. take tea/coffee/milk թեյ/սուրճ/կաթ խմել. (պահանջել, հարկավոր լինել) It takes courage Քաջություն է հարկավոր ունենալ. It takes two hours Երկու ժամ է հարկավոր. take a house for the summer ամառվա համար տուն վարձել/զբաղեցնել. take aback շփոթեցնել, անակնկալի բերել. take after նմանվել. take apart քանդել, մաս-մաս անել. take down իջեցնել, գրի առնել. take for մեկի տեղը ընդունել, սխալվել. take for granted որպես պատշաճ ընդունել. ապացուցված/հնա րավոր համարել. take away տանել, հեռացնել. take one’s breath away շունչը կտրվել. take in ըն դունել, հասկանալ be taken in խսկց. խաբված լինել. take into one’s head գլուխը մտցնել. take off հեռանալ. ավ. թռչել, օդ բարձրանալ. take out հանել, դուրս բերել, զբոսանքի տանել. take over փոխարինել. take to հակվել. տարվել մի բանով. take to bed անկողին ընկնել. take to heart սրտին մոտ ընդունել. take to the road թա փառա շջիկ դառնալ. take up բարձրացնել. It takes up too much time Դա շատ ժամանակ է զբա ղեցնում. (սկսել, ձեռնարկել) take up music երաժշտությամբ զբաղվել. take up one’s idea միտքը/գաղափարը վերցնել. take up arms զենք վերցնել, զենքի դիմել. take up a quarrel վեճը հարթել. take up with մտերմանալ մեկի հետ

    English-Armenian dictionary > take

  • 53 Donald, Ian

    SUBJECT AREA: Medical technology
    [br]
    b. 27 December 1910 Paisley, Scotland
    d. 19 June 1987 Paglesham, Essex, England
    [br]
    Scottish obstetrician and gynaecologist, pioneer of the diagnostic use of ultrasound in medicine.
    [br]
    After he received his initial education in Scotland, Donald's family moved to South Africa, where he obtained a BA degree in Cape Town in 1930. After the death of his parents he returned to England, graduating in medicine in 1937. He served in the RAF from 1942 to 1946 and was awarded the MBE for bravery in rescuing air-crews. In 1954, following a fruitful period as Reader and Lecturer at St Thomas's Hospital and the Hammersmith Hospital, he was appointed Regius Professor of Midwifery in Glasgow. It was while at St Thomas's and Hammersmith that he evolved a demand-response respirator for infants. With the assistance of Tom Brown, an engineer, and the company Kelvin Hughes—which had earlier produced ultrasound equipment for detecting flaws in metal castings—he was able to originate, develop and improve the diagnostic use of ultra-sound in obstetrics and gynaecology. The use of this technique rapidly spread into other disciplines. Donald was fortunate in that the procedure proved to have no untoward influence on pregnancy; at the time, little was known of possible side effects.
    He was the proponent of other advances in the speciality, including laparoscopy, breast-feeding and the preservation of the membranes during labour. An ardent anti-abortionist, his authoritarian Scottish approach made Glasgow a world centre, with himself as a renowned and loved teacher. Despite undergoing three major cardiac interventions, his longevity did not surprise those who knew of his immense vitality.
    [br]
    Principal Honours and Distinctions
    CBE 1973. Honorary DSc, London and Glasgow Universities. Royal College of Obstetricians and Gynaecologists Eardley Holland Gold Medal. Royal College of Surgeons Victor Bonney Prize. Royal Society of Medicine Blair Bell Gold Medal.
    Bibliography
    1958, "Investigation of abdominal masses by pulsed ultrasound", Lancet (with Brown and MacVicar).
    Numerous other papers in learned journals.
    Further Reading
    Obituary, 1987, Lancet (18 July).
    MG

    Biographical history of technology > Donald, Ian

  • 54 Gaskill, Harvey Freeman

    [br]
    b. 19 January 1845 Royalton, New York, USA
    d. 1 April 1889 Lockport, New York, USA
    [br]
    American mechanical engineer, inventor of the water-pumping engine with flywheel and reciprocating pumps.
    [br]
    Gaskill's father was a farmer near New York, where the son attended the local schools until he was 16 years old. At the age of 13 he already showed his mechanical aptitude by inventing a revolving hayrake, which was not exploited because the family had no money. His parents moved to Lockport, New York, where Harvey became a student at Lockport Union School and then the Poughkeepsie Commercial College, from which he graduated in 1866. After a period in his uncle's law office, he entered the firm of Penfield, Martin \& Gaskill to manufacture a patent clock. Then he was involved in a planing mill and a sash-and-blind manufactory. He devised a clothes spinner and a horse hayrake, but he did not manufacture them. In 1873 he became a draughtsman in the Holly Manufacturing Company in Lockport, which made pumping machinery for waterworks. He was promoted first to Engineer and then to Superintendent of the company in 1877. In 1885 he became a member of the Board of Directors and Vice-President. But for his untimely death, he might have become President. He was also a director of several other manufacturing concerns, public utilities and banks. In 1882 he produced a pump driven by a Woolf compound engine, which was the first time that rotary power with a crank and flywheel had been applied in waterworks. His design was more compact, more economical and lower in cost than previous types and gave the Holly Company a considerable advantage for a time over their main rivals, the Worthington Pump \& Machinery Company. These steam pumps became very popular in the United States and the type was also adopted in Britain.
    [br]
    Further Reading
    As well as obituaries appearing in many American engineering journals on Gaskill's death, there is an entry in the Dictionary of American Biography, 1931, Vol. VII, New York, C.Scribner's Sons.
    RLH

    Biographical history of technology > Gaskill, Harvey Freeman

  • 55 publicist\ style

    covering such genres as essay, feature article, most writing of "new journalism", public speeches, etc. (V.A.K.)
    ••
    The general aim is to exert a constant and deep influence on public opinion, to convince the reader or the listener that the interpretation given by the writer of the speaker is the only correct one and to cause him to accept the point of view... not merely by logical argumentation, but by emotional appeal as well (brain-washing function).
    - features of publicist style
    Substyles: oratorical (direct contact with the listeners); radio commentary; essay (moral, philosophical, literary; book review in journals and magazines, pamphlets); articles (political, social, economic).
    Source: I.R.G.
    See: publicist style
    ••
    имеет своей основной функцией воздействие на волю, сознание и чувства слушателя или читателя (I.V.A.)
    See: functional style, stylistic device

    English-Russian dictionary of stylistics (terminology and examples) > publicist\ style

  • 56 a visiting fireman

    амер.; разг.
    1) именитый, важный гость, заезжая знаменитость

    Ever since the Buddhist trouble started, the local correspondents have been very hostile to Cung. So he's started feeding out comment through visiting firemen: representatives of the foreign Catholic press, magazine writers and stringers for odd journals who drift in and of Saigon, looking for features. (M. West, ‘The Ambassador’, ch. VII) — С тех пор, как началась эта история с буддистами, местные корреспонденты стали чрезвычайно враждебно относиться к Кунгу. И он для оглашения своих взглядов использовал влиятельных заезжих визитеров: представителей иностранной католической прессы, журналистов и разных борзописцев - газетчиков, курсирующих из Сайгона и в Сайгон в поисках материала.

    The president's wife is a hopeless alcoholic and I've had to do the entertaining of the visiting firemen. (J. O'Hara, ‘Elizabeth Appleton’, ch. XI) — Супруга ректора - хронический алкоголик, вот мне и приходится заниматься приемом именитых гостей.

    2) гость, посетитель, турист (особ. не останавливающийся перед расходами)

    The Senior Senator was going to be stripped of his dignity. He would be... curtly introduced like a visiting fireman, and that was all. No toasts. No words about his years of service, no place of honor. (W. Manchester, ‘The Death of a President’, ch. 1) — Хотели унизить его достоинство. Его, старейшего сенатора штата! Хотели... наспех представить его президенту - просто ни слова о его многолетних заслугах, ни почетного места.

    Girls... will show your visitors what most visiting firemen want to see. (WD) — Девушки... покажут вашим гостям все, что так хотят видеть заезжие визитеры, швыряющие деньги налево и направо.

    Large English-Russian phrasebook > a visiting fireman

  • 57 Mendes, Aristides de Sousa

    (1885-1954)
       Career Portuguese diplomat whose extraordinary assistance to Jewish and other refugees in 1940 France led to his career's ruin, but posthumous fame and recognition. A conventional member of Portugal's governing elite and devoutly Catholic, Aristides de Sousa Mendes was educated like his twin brother, who was also a diplomat, at Coimbra University. He entered Portugal's foreign service, consular track, in 1910 and served in a variety of posts in Europe, Africa, Latin America, and the United States. Less successful as a diplomat than his brother César, who briefly served as foreign minister and attained the rank of ambassador, Aristides de Sousa Mendes was assigned to be Portuguese consul in Bordeaux, France, in 1938. When thousands of desperate refugees fleeing the German armies poured into Sousa Mendes's consulate in June 1940, Lisbon ordered him to cease signing visas to enter Portugal.
       Defying his superiors' orders, Sousa Mendes signed perhaps as many as 20,000-30,000 visas, after deciding not to charge fees to applicants. Because of his action in Bordeaux and at the Franco-Spanish frontier, where he also assisted refugees to escape the Nazi terror, Sousa Mendes was dismissed from his post and recalled to Lisbon. Following his suspension from service and the granting of a minuscule pension, the former diplomat and his family fell into poverty and obscurity. Through the efforts of his family and helpful foreign diplomats, Israel in 1967 declared Sousa Mendes a Hero of Conscience of World War II and a Righteous Gentile. In the 1980s, Portugal's government officially rehabilitated and recognized posthumously this obscure but heroic figure, and his deeds were celebrated in books, journals, newspaper articles, and TV films.

    Historical dictionary of Portugal > Mendes, Aristides de Sousa

  • 58 Morgan, Lewis Henry

    (1818-1881) Морган, Льюис Генри
    Этнолог, антрополог, выдающийся исследователь первобытного общества. В 1840-х гг. провел фундаментальное исследование родовых и семейных связей и культуры ирокезов, завершив его публикацией книги "Лига ходеносауни, или Ирокезы" ["The League of the Ho-De'-No-Sau-Nee, or Iroquois"] (1851). Значительную часть жизни прожил среди индейцев Северо-Востока страны, был усыновлен племенем сенека, получил индейское имя - Тот, кто служит Мостом. Провел несколько полевых исследований среди племен Запада и Юго-Запада страны, завершившихся работой "Системы кровного и духовного родства в семейных отношениях людей" ["Systems of Consaguinity and Affinity of the Human Family"] (1871). Труд "Древнее общество, или Исследование линий человеческого прогресса от дикости через варварство к цивилизации" ["Ancient Society, or Researches in the Line of Human Progress from Savagery Through Barbarism to Civilization"] (1877) лег в основу книги Ф. Энгельса "Происхождение семьи, частной собственности и государства". Кроме того опубликовал работы "Американский бобр и его работа" ["The American Beaver and His Works"] (1868), "Дом и домашняя жизнь аборигенов Америки" ["Houses and House-Life of the American Aborigines"] (1881) и др. Был членом Национальной академии наук, в 1880 стал президентом Американской ассоциации содействия прогрессу науки [ American Association for the Advancement of Science]. В 1959 переизданы его "Индейские дневники" ["Indian Journals"] (1859-62). Вошел в историю страны как "отец американской антропологии"

    English-Russian dictionary of regional studies > Morgan, Lewis Henry

  • 59 expect

    1. I
    1) coll, just as I expected как я и думал /ожидал/; it is not so difficult as I expected это менее сложно, чем я думал /предполагал/; better than I expected лучше, чем я предполагал /рассчитывал/; I knew what to expect я знал, на что можно надеяться
    2) she is expecting она ждет ребенка /в положении/
    2. II
    || expect so coll. полагаю, что так; will he be late? expect I expect so как вы думаете, он опоздает? expect Наверно; will he need help? expect I don't expect so ему понадобится помощь? expect Думаю, что нет
    3. III
    expect smth., smb.
    1) expect a letter (that question, failure, a thunderstorm, war, one's friends, visitors, etc.) ожидать письма и т.д.; I didn't expect such unkindness я никак не ждал /не ожидал/ такого плохого отношения; expect obedience (kind treatment, quick results. etc.) рассчитывать на повиновение и т.д.; you shouldn't expect too much не следует возлагать слишком больших надежд; that's expecting too much это уж слишком, вы очень многого хотите
    2) expect smb. expect a baby (one's second, a son, etc.) ждать ребёнка и т.д.
    4. IV
    expect smb., smth. in some manner expect smb., smth. anxiously (confidently, breathlessly, vainly, hourly, etc.) ожидать кого-л., чего-л. с нетерпением /нетерпеливо/ и т.д.; he little expected that он меньше всего ждал этого: expect smb., smth. at some time expect smb., smth. next week (every moment, tonight, etc.) ожидать кого-л., чего-л. на следующей неделе и т.д.; I expect him here any day я жду его здесь со дня на день; when do you expect the next train? когда следующий поезд?
    5. VII
    expect smb. to do smth. expect smb. to come (to obey, to work hard, to be waiting for me, to be punctual, to do such a thing, to do smth. without fail, to do all that work in one day, etc.) рассчитывать на то, что кто-л. придет и т.д.; требовать, чтобы кто-л. пришел и т.д.; what do you expect me to do? чего вы от меня ждете?; I expected him to recover (to outlive her, to win the race, etc.) я надеялся /ждал/, что он выздоровеет и т.д.; I don't expect him to come я не жду его, я не думаю /не надеюсь/, что он придет; expect every man to do his duty требовать от каждого выполнения долга
    6. XI
    be expected it is not to be expected этого нельзя ожидать, на это нельзя рассчитывать; be expected of smb. as might be expected of him от него этого и следовало ожидать
    7. XIII
    expect to do smth.
    1) expect to go there (to see smb., tobe back on Sunday, etc.) надеяться /собираться/ пойти туда и т.д.; I expect to be paid я рассчитываю, что мне заплатят; I never expected to see him again я совершенно не надеялся встретить его снова; you would expect there to be strong disagreement about this естественно было бы предположить, что по этому поводу возникнут серьезные разногласия
    2) they expected to meet with great difficulties они были готовы встретить серьезные затруднения; she expects to be dismissed она думает, что ее уволят
    8. XXI1
    expect smth. from /of /smb., smth. expect a letter from her (a visit from my mother, aid from friends, too much of her, kindness from them, nothing from such people, great things of him, mercy from him, information and entertainment from the daily journals, etc.) ожидать письма от нее и т.д.; what can you expect of him? чего от него ждать?, что с него взять?; expect smth. for smth. expect payment for this (so much for so little, etc.) рассчитывать получить плату за это и т.д.; expect smb. to smth. expect smb. to dinner (to lunch, etc.) ждать кого-л. к обеду и т.д.; expect smb., smth. at some time expect smb. at any moment ожидать кого-л. /чьего-л. прихода/ в любую минуту; we expect their arrival in summer мы ждем их приезда летом; you can't expect good weather at this time of year в это время года не бывает хорошей погоды
    9. XXV
    expect [that]... coll. I expect that I will be paid (he'll pay, you've already heard, a friend will come soon, you are tired from the trip, etc.) я полагаю, [что] мне заплатят и т.д.; I expect they will let me know думаю /надо думать/, [что] они дадут мне знать; I expect you had a hard time finding this house вам, вероятно, нелегко было найти этот дом; I expect [that] it will be all right надеюсь, что все будет в порядке /что все обойдется/ abs who has eaten all the cake? expect Oh, I expect it was Tom кто съел весь пирог? expect Наверно. Том

    English-Russian dictionary of verb phrases > expect

  • 60 ICSA

    abbr. Fin
    Institute of Chartered Secretaries and Administrators: in the United Kingdom, an organization that works to promote the efficient administration of commerce, industry, and public affairs. Founded in 1891 and granted a Royal Charter in 1902, it represents the interests of its members to government, publishes journals and other materials, promotes the standing of its members, and provides educational support and qualifying programs.

    The ultimate business dictionary > ICSA

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