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mining+methods

  • 1 determination of the amount of a desired constituent in ores, metallurgical residues, and alloys by methods other than those involving liquid means of separation

    Gold mining: dry assay, dry assaying

    Универсальный русско-английский словарь > determination of the amount of a desired constituent in ores, metallurgical residues, and alloys by methods other than those involving liquid means of separation

  • 2 технология открытых горных работ

    Универсальный русско-английский словарь > технология открытых горных работ

  • 3 инженер-методист

    Универсальный русско-английский словарь > инженер-методист

  • 4 Treadgold, Arthur Newton Christian

    [br]
    b. August 1863 Woolsthorpe, Grantham, Lincolnshire, England
    d. 23 March 1951 London, England
    [br]
    English organizer of the Yukon gold fields in Canada, who introduced hydraulic mining.
    [br]
    A direct descendant of Sir Isaac Newton, Treadgold worked as a schoolmaster, mostly at Bath College, for eleven years after completing his studies at Oxford University. He gained a reputation as an energetic teacher who devoted much of his work to sport, but he resigned his post and returned to Oxford; here, in 1897, he learned of the gold rush in the Klondike in the Canadian northwest. With a view to making his own fortune, he took a course in geology at the London Geological College and in 1898 set off for Dawson City, in the Yukon Territory. Working as a correspondent for two English newspapers, he studied thoroughly the situation there; he decided to join the stampede, but as a rather sophisticated gold hustler.
    As there were limited water resources for sluicing or dredging, and underground mining methods were too expensive, Treadgold conceived the idea of hydraulic mining. He designed a ditch-and-siphon system for bringing large amounts of water down from the mountains; in 1901, after three years of negotiation with the Canadian government in Ottawa, he obtained permission to set up the Treadgold Concession to cover the water supply to the Klondike mining claims. This enabled him to supply giant water cannons which battered the hillsides, breaking up the gravel which was then sluiced. Massive protests by the individual miners in the Dawson City region, which he had overrun with his system, led to the concession being rescinded in 1904. Two years later, however, Treadgold began again, forming the Yukon Gold Company, initially in partnership with Solomon Guggenheim; he started work on a channel, completed in 1910, to carry water over a distance of 115 km (70 miles) down to Bonanza Creek. In 1919 he founded the Granville Mining Company, which was to give him control of all the gold-mining operations in the southern Klondike region. When he returned to London in the following year, the company began to fail, and in 1920 he went bankrupt with liabilities totalling more than $2 million. After the Yukon Consolidated Gold Corporation had been formed in 1923, Treadgold returned to the Klondike in 1925 in order to acquire the assets of the operating companies; he gained control and personally supervised the operations. But the company drifted towards disaster, and in 1930 he was dismissed from active management and his shares were cancelled by the courts; he fought for their reinstatement right up until his death.
    [br]
    Further Reading
    L.Green, 1977, The Gold Hustlers, Anchorage, Alaska (describes this outstanding character and his unusual gold-prospecting career).
    WK

    Biographical history of technology > Treadgold, Arthur Newton Christian

  • 5 система за разработване

    мин.
    mining method
    мин.
    mining methods

    Български-Angleščina политехнически речник > система за разработване

  • 6 щитова система на разработване

    мин.
    shield mining method
    мин.
    shield mining methods

    Български-Angleščina политехнически речник > щитова система на разработване

  • 7 инженер по организации производства

    Универсальный русско-английский словарь > инженер по организации производства

  • 8 Отдел разработки различных способов бурения

    Универсальный русско-английский словарь > Отдел разработки различных способов бурения

  • 9 безопасные методы работы

    Универсальный русско-английский словарь > безопасные методы работы

  • 10 геофизические методы

    Универсальный русско-английский словарь > геофизические методы

  • 11 методы обеспыливания

    Универсальный русско-английский словарь > методы обеспыливания

  • 12 Garforth, William Edward

    [br]
    b. 1845 Dukinfield, Cheshire, England
    d. 1 October 1921 Pontefract, Yorkshire, England
    [br]
    English colliery manager, pioneer in machine-holing and the safety of mines.
    [br]
    After Menzies conceived his idea of breaking off coal with machines in 1761, many inventors subsequently followed his proposals through into the practice of underground working. More than one century later, Garforth became one of the principal pioneers of machine-holing combined with the longwall method of working in order to reduce production costs and increase the yield of coal. Having been appointed agent to Pope \& Pearson's Collieries, West Yorkshire, in 1879, of which company he later became Managing Director and Chairman, he gathered a great deal of experience with different methods of cutting coal. The first disc machine was exhibited in London as early as 1851, and ten years later a pick machine was invented. In 1893 he introduced an improved type of deep undercutting machine, his "diamond" disc coal-cutter, driven by compressed air, which also became popular on the European continent.
    Besides the considerable economic advantages it created, the use of machinery for mining coal increased the safety of working in hard and thin seams. The improvement of safety in mining technology was always his primary concern, and as a result of his inventions and his many publications he became the leading figure in the British coal mining industry at the beginning of the twentieth century; safety lamps still carry his name. In 1885 he invented a firedamp detector, and following a severe explosion in 1886 he concentrated on coal-dust experiments. From the information he obtained of the effect of stone-dust on a coal-dust explosion he proposed the stone-dust remedy to prevent explosions of coal-dust. As a result of discussions which lasted for decades and after he had been entrusted with the job of conducting the British coal-dust experiments, in 1921 an Act made it compulsory in all mines which were not naturally wet throughout to treat all roads with incombustible dust so as to ensure that the dust always consisted of a mixture containing not more than 50 per cent combustible matter. In 1901 Garforth erected a surface gallery which represented the damaged roadways of a mine and could be filled with noxious fumes to test self-contained breathing apparata. This gallery formed the model from which all the rescue-stations existing nowadays have been developed.
    [br]
    Principal Honours and Distinctions
    Knighted 1914. LLD Universities of Birmingham and Leeds 1912. President, Midland Institute 1892–4. President, The Institution of Mining Engineers 1911–14. President, Mining Association of Great Britain 1907–8. Chairman, Standing Committee on Mining, Advisory Council for Scientific and Industrial Research. Fellow of the Geological Society of London. North of England Institute of Mining and Mechanical Engineers Greenwell Silver Medal 1907. Royal Society of Arts Fothergill Gold Medal 1910. Medal of the Institution of Mining Engineers 1914.
    Bibliography
    1901–2, "The application of coal-cutting machines to deep mining", Transactions of the Federated Institute of Mining Engineers 23: 312–45.
    1905–6, "A new apparatus for rescue-work in mines", Transactions of the Institution of Mining Engineers 31:625–57.
    1902, "British Coal-dust Experiments". Paper communicated to the International Congress on Mining, Metallurgy, Applied Mechanics and Practical Geology, Dusseldorf.
    Further Reading
    Garforth's name is frequently mentioned in connection with coal-holing, but his outstanding achievements in improving safety in mines are only described in W.D.Lloyd, 1921, "Memoir", Transactions of the Institution of Mining Engineers 62:203–5.
    WK

    Biographical history of technology > Garforth, William Edward

  • 13 Born, Ignaz Edler von

    [br]
    b. 26 December 1742 Karlsburg, Transylvania (now Alba lulia, Romania)
    d. 24 July 1791 Vienna, Austria
    [br]
    Austrian metallurgical and mining expert, inventor of the modern amalgamation process.
    [br]
    At the University of Prague he studied law, but thereafter turned to mineralogy, physics and different aspects of mining. In 1769–70 he worked with the mining administration in Schemnitz (now Banská Stiavnica, Slovakia) and Prague and later continued travelling to many parts of Europe, with special interests in the mining districts. In 1776, he was charged to enlarge and systematically to reshape the natural-history collection in Vienna. Three years later he was appointed Wirklicher Hofrat at the mining and monetary administration of the Austrian court.
    Born, who had been at a Jesuit college in his youth, was an active freemason in Vienna and exercised remarkable social communication. The intensity of his academic exchange was outstanding, and he was a member of more than a dozen learned societies throughout Europe. When with the construction of a new metallurgic plant at Joachimsthal (now Jáchymov, Czech Republic) the methods of extracting silver and gold from ores by the means of quicksilver demanded acute consideration, it was this form of scientific intercourse that induced him in 1786 to invite many of his colleagues from several countries to meet in Schemnitz in order to discuss his ideas. Since the beginnings of the 1780s Born had developed the amalgamation process as had first been applied in Mexico in 1557, by mixing the roasted and chlorinated ores with water, ingredients of iron and quicksilver in drums and having the quicksilver refined from the amalgam in the next step. The meeting led to the founding of the Societät der Bergbaukunde, the first internationally structured society of scientists in the world. He died as the result of severe injuries suffered in an accident while he was studying fire-setting in a Slovakian mine in 1770.
    [br]
    Bibliography
    1774 (ed.), Briefe an J.J.Ferber über mineralogische Gegenstände, Frankfurt and Leipzig.
    1775–84, Abhandlungen einer Privatgesellschaft in Böhmen, zur Aufnahme der
    Mathematik, der vaterländischen Geschichte und der Naturgeschichte, 6 vols, Prague. 1786, Über das Anquicken der gold-und silberhaltigen Erze, Rohsteine, Schwarzkupfer
    und Hüttenspeise, Vienna.
    1789–90, co-edited with F.W.H.von Trebra, Bergbaukunde, 2 vols, Leipzig.
    Further Reading
    C.von Wurzbach, 1857, Biographisches Lexikon des Kaiserthums Österreich, Vol. II, pp. 71–4.
    L.Molnár and A Weiß, 1986, Ignaz Edler von Born und die Societät der Bergbaukunde 1786, Vienna: Bundesministerium für Handel, Gewerbe und Industrie (provides a very detailed description of his life, the amalgamation process and the society of 1786). G.B.Fettweis, and G.Hamann (eds), 1989, Über Ignaz von Born und die Societät der
    Bergbaukunde, Vienna: Verlag der Österreichischen Akademie der Wissenschaft (provides a very detailed description).
    WK

    Biographical history of technology > Born, Ignaz Edler von

  • 14 Crælius, Per Anton

    [br]
    b. 2 November 1854 Stockholm, Sweden
    d. 7 August 1905 Stockholm, Sweden
    [br]
    Swedish mining engineer, inventor of the core drilling technique for prospecting purposes.
    [br]
    Having completed his studies at the Technological Institute in Stockholm and the Mining School at Falun, Crælius was awarded a grant by the Swedish Jernkontoret and in 1879 he travelled to Germany, France and Belgium in order to study technological aspects of the mining, iron and steel industries. In the same year he went to the United States, where he worked with an iron works in Colorado and a mining company in Nevada. In 1884, having returned to Sweden, he obtained an appointment in the Norberg mines; two years later, he took up employment at the Ängelsberg oilmill.
    His mining experience had shown him the demand for a reliable, handy and cheap method of drilling, particularly for prospecting purposes. He had become acquainted with modern drilling methods in America, possibly including Albert Fauck's drilling jar. In 1886, Crælius designed his first small-diameter drill, which was assembled in one unit. Its rotating boring rod, smooth on the outside, was fixed inside a hollow mandrel which could be turned in any direction. This first drill was hand-driven, but the hydraulic version of it became the prototype for all near-surface prospecting drills in use worldwide in the late twentieth century.
    Between 1890 and 1900 Crælius was managing director of the Morgårdshammar mechanical workshops, where he was able to continue the development of his drilling apparatus. He successfully applied diesel engines in the 1890s, and in 1895 he added diamond crowns to the drill. The commercial exploitation of the invention was carried out by Svenska Diamantbergborrings AB, of which Crælius was a director from its establishment in 1886.
    [br]
    Further Reading
    G.Glockemeier, 1913, Diamantbohrungen für Schürf-und Aufschlußarbeiten über und unter Tage, Berlin (examines the technological aspects of Crælius's drilling method).
    A.Nachmanson and K.Sundberg, 1936, Svenska Diamantbergborrings Aktiebolaget 1886–1936, Uppsala (outlines extensively the merits of Crælius's invention).
    WK

    Biographical history of technology > Crælius, Per Anton

  • 15 Agricola, Georgius (Georg Bauer)

    SUBJECT AREA: Metallurgy
    [br]
    b. 24 March 1494 Glauchau, Saxony
    d. 21 November 1555 Chemnitz, Germany
    [br]
    German metallurgist, who wrote the book De Re Metallica under the latinized version of his name.
    [br]
    Agricola was a physician, scientist and metallurgist of note and it was this which led to the publication of De Re Metallica. He studied at Leipzig University and between 1518 and 1522 he was a school teacher in Zwickau. Eventually he settled as a physician in Chemnitz. Later he continued his medical practice at Joachimstal in the Erzgebirge. This town was newly built to serve the mining community in what was at the time the most important ore-mining field in both Germany and Europe.
    As a physician in the sixteenth century he would naturally have been concerned with the development of medicines, which would have led him to research the medical properties of ores and base metals. He studied the mineralogy of his area, and the mines, and the miners who were working there. He wrote several books in Latin on geology and mineralogy. His important work during that period was a glossary of mineralogical and mining terms in both Latin and German. It is, however, De Re Metallica for which he is best known. This large volume contains twelve books which deal with mining and metallurgy, including an account of glassmaking. Whilst one can understand the text of this book very easily, the quality of the illustrative woodcuts should not be neglected. These illustrations detail the mines, furnaces, forges and the plant associated with them, unfortunately the name of the artist is unknown. The importance of the work lies in the fact that it is an assemblage of information on all the methods and practices current at that time. The book was clearly intended as a textbook of mining and mineralogy and as such it would have been brought to England by German engineers when they were employed by the Mines Royal in the Keswick area in the late sixteenth century. In addition to his studies in preparation for De Re Metallica, Agricola was an "adventurer" holding shares in the Gottesgab mine in the Erzegebirge.
    [br]
    Principal Honours and Distinctions Bibliography
    1556, De Re Metallica, Basel; 1912, trans. H. Hoover and L.H.Hoover, London.
    KM

    Biographical history of technology > Agricola, Georgius (Georg Bauer)

  • 16 Raky, Anton

    [br]
    b. 5 January 1868 Seelenberg, Taunus, Germany
    d. 22 August 1943 Berlin, Germany
    [br]
    German inventor of rapid percussion drilling, entrepreneur in the exploration business.
    [br]
    While apprenticed at the drilling company of E. Przibilla, Raky already called attention by his reflections towards developing drilling methods and improving tools. Working as a drilling engineer in Alsace, he was extraordinarily successful in applying an entire new hydraulic boring system in which the rod was directly connected to the chisel. This apparatus, driven by steam, allowed extremely rapid percussions with very low lift.
    With some improvements, his boring rig drilled deep holes at high speed and at least doubled the efficiency of the methods hitherto used. His machine, which was also more reliable, was secured by a patent in 1895. With borrowed capital, he founded the Internationale Bohrgesellschaft in Strasbourg in the same year, and he began a career in the international exploration business that was unequalled as well as breathtaking. Until 1907 the total depth of the drillings carried out by the company was 1,000 km.
    Raky's rapid drilling was unrivalled and predominant until improved rotary drilling took over. His commercial sense in exploiting the technical advantages of his invention by combining drilling with producing the devices in his own factory at Erkelenz, which later became the headquarters of the company, and in speculating on the concessions for the explored deposits made him by far superior to all of his competitors, who were provoked into contests which they generally lost. His flourishing company carried out drilling in many parts of the world; he became the initiator of the Romanian oil industry and his extraordinary activities in exploring potash and coal deposits in different parts of Germany, especially in the Ruhr district, provoked the government in 1905 into stopping granting claims to private companies. Two years later, he was forced to withdraw from his holding company because of his restless and eccentric character. He turned to Russia and, during the First World War, he was responsible for the reconstruction of the destroyed Romanian oilfields. Thereafter, partly financed by mining companies, he continued explorations in several European countries, and in Germany he was pioneering again with exploring oilfields, iron ore and lignite deposits which later grew in economic value. Similar to Glenck a generation before, he was a daring entrepreneur who took many risks and opened new avenues of exploration, and he was constantly having to cope with a weak financial position, selling concessions and shares, most of them to Preussag and Wintershall; however, this could not prevent his business from collapse in 1932. He finally gave up drilling in 1936 and died a poor man.
    [br]
    Principal Honours and Distinctions
    Dr-Ing. (Hon.) Bergakademie Clausthal 1921.
    Further Reading
    G.P.R.Martin, 1967, "Hundert Jahre Anton Raky", Erdöl-Erdgas-Zeitschrift, 83:416–24 (a detailed description).
    D.Hoffmann, 1959, 150 Jahre Tiefbohrungen in Deutschland, Vienna and Hamburg: 32– 4 (an evaluation of his technologial developments).
    WK

    Biographical history of technology > Raky, Anton

  • 17 Chaudron, Joseph

    [br]
    b. 29 November 1822 Gosselies, Belgium
    d. 16 January 1905 Auderghem, Belgium
    [br]
    Belgian mining engineer, pioneer in boring shafts.
    [br]
    In 1842, as a graduate of the Ecole des Mines in Liège, he became a member of the Belgian Corps Royal des Mines, which he left ten years later as Chief Engineer. By that time he had become decisively influential in the Société Anglo-Belge des Mines du Rhin, founded in 1848. After it became the Gelsenkirchen-based Bergwerkgesellschaft Dahlbusch in 1873, he became President of its Board of Directors and remained in this position until his death. Thanks to his outstanding technical and financial abilities, the company developed into one of the largest in the Ruhr coal district.
    When K.G. Kind practised his shaft-boring for the company in the early 1850s but did not overcome the difficulty of making the bottom of the bore-hole watertight, Chaudron joined forces with him to solve the problem and constructed a rotary heading which was made watertight with a box stuffed with moss; rings of iron tubing were placed on this as the sinking progressed, effectively blocking off the aquiferous strata as a result of the hydrostatic pressure which helped support the weight of the tubing until it was secured permanently. The Kind-Chaudron system of boring shafts in the full section marked an important advance upon existing methods, and was completely applied for the first time at a coalmine near Mons, Belgium, in 1854–6. In Brussels Chaudron and Kind founded the Société de Fonçage par le Procédé Kind et Chaudron in 1854, and Chaudron was granted a patent the next year. Foreign patents followed and the Kind-Chaudron system was the one most frequently applied in the latter part of the nineteenth century. Altogether, under Chaudron's control, there were more than eighty shafts sunk in wet strata in Germany, Belgium, France and England.
    [br]
    Bibliography
    1853–4, "Notice sur le procédé inventé par l'ingénieur Kind, pour l"établissement des puits de mines', Annales des travaux publics de Belgique 12:327–38.
    1862, "Über die nach dem Kindschen Erdbohrverfahren in Belgien ausgefùhrten Schachtbohrarbeiten", Berg-und Hüttenmännische Zeitschrift 21:402−7, 419−21, 444−7.
    1867, "Notice sur les travaux exécutés en France, en Belgique et en Westphalie de 1862– 1867", Annales des travaux publics de Belgique 25: 136–45.
    1872, "Remplacement d'un cuvelage en bois par un cuvelage en fonte", Annales des
    travaux publics de Belgique 30:77–91.
    Further Reading
    D.Hoffmann, 1962, Acht Jahrzehnte Gefrierverfahren nachPötsch, Essen, pp. 12–18 (evaluates the Kind-Chaudron system as a new era).
    W.Kesten, 1952, Geschichte der Bergwerksgesellschaft Dahlbusch, Essen (gives a delineation of the mining company's flourishing as well as the technical measures under his influence).
    T.Tecklenburg, 1914, Handbuch der Tiefbohrkunde, 2nd edn, Vol VI, Berlin, pp. 39–58 (provides a detailed description of Chaudron's tubing).
    WK

    Biographical history of technology > Chaudron, Joseph

  • 18 Coster, John

    [br]
    b. c. 1647 Gloucestershire, England
    d. 13 October 1718 Bristol, England
    [br]
    English innovator in the mining, smelting and working of copper.
    [br]
    John Coster, son of an iron-forge manager in the Forest of Dean, by the age of 38 was at Bristol, where he was "chief agent and sharer therein" in the new lead-smelting methods using coal fuel. In 1685 the work, under Sir Clement Clerke, was abandoned because of patent rights claimed by Lord Grandison, who financed of earlier attempts. Clerke's business turned to the coal-fired smelting of copper under Coster, later acknowledged as responsible for the subsequent success through using an improved reverberatory furnace which separated coal fume from the ores being smelted. The new technique, applicable also to lead and tin smelting, revitalized copper production and provided a basis for new British industry in both copper and brass manufacture during the following century. Coster went on to manage a copper-smelting works, and by the 1690s was supplying Esher copper-and brass-works in Surrey from his Redbrook, Gloucestershire, works on the River Wye. In the next decade he extended his activities to Cornish copper mining, buying ore and organizing ore sales, and supplying the four major copper and brass companies which by then had become established. He also made copper goods in additional water-powered rolling and hammer mills acquired in the Bristol area. Coster was ably assisted by three sons; of these, John and Robert were mainly active in Cornwall. In 1714 the younger John, with his father, patented an "engine for drawing water out of deep mines". The eldest son, Thomas, was more involved at Redbrook, in South Wales and the Bristol area. A few years after the death of his father, Thomas became partner in the brass company of Bristol and sold them the Redbrook site. He became Member of Parliament for Bristol and, by then the only surviving son, planned a large new smelting works at White Rock, Swansea, South Wales, before his death in 1734. Partners outside the family continued the business under a new name.
    [br]
    Bibliography
    1714, British patent 397, with John Coster Jr.
    Further Reading
    Rhys Jenkins, 1942, "Copper works at Redbrook and Bristol", Transactions of the Bristol and Gloucestershire Archaeological Society 63.
    Joan Day, 1974–6, "The Costers: copper smelters and manufacturers", Transactions of the Newcomen Society 47:47–58.
    JD

    Biographical history of technology > Coster, John

  • 19 Ercker, Lazarus

    [br]
    b. c.1530 Annaberg, Saxony, Germany
    d. 1594 Prague, Bohemia
    [br]
    German chemist and metallurgist.
    [br]
    Educated at Wittenberg University during 1547–8, Ercker obtained in 1554, through one of his wife's relatives, the post of Assayer from the Elector Augustus at Dresden. From then on he took a succession of posts in mining and metallurgy. In 1555 he was Chief Consultant and Supervisor of all matters relating to mines, but for some unknown reason was demoted to Warden of the Mint at Annaberg. In 1558 he travelled to the Tyrol to study the mines in that region, and in the same year Prince Henry of Brunswick appointed him Warden, then Master, of the Mint at Goslar. Ercker later moved to Prague where, through another of his wife's relatives, he was appointed Control Tester at Kutna Hora. It was there that he wrote his best-known book, Die Beschreibung allfürnemisten mineralischen Ertz, which drew him to the attention of the Emperor Maximilian, who made him Courier for Mining and a clerk of the Supreme Court of Bohemia. The next Emperor, Rudolf II, a noted patron of science and alchemy, promoted Ercker to Chief Inspector of Mines and ennobled him in 1586 with the title Von Schreckenfels'. His second wife managed the mint at Kutna Hora and his two sons became assayers. These appointments gained him much experience of the extraction and refining of metals. This first bore fruit in a book on assaying, Probierbüchlein, printed in 1556, followed by one on minting, Münzbuch, in 1563. His main work, Die Beschreibung, was a systematic review of the methods of obtaining, refining and testing the alloys and minerals of gold, silver, copper, antimony, mercury and lead. The preparation of acids, salts and other compounds is also covered, and his apparatus is fully described and illustrated. Although Ercker used Agricola's De re metattica as a model, his own work was securely based on his practical experience. Die Beschreibung was the first manual of analytical and metallurgical chemistry and influenced later writers such as Glauber on assaying. After the first edition in Prague came four further editions in Frankfurt-am-Main.
    [br]
    Bibliography
    Die Beschreibung allfürnemisten mineralischen Ertz, Prague. 1556, Probierbuchlein.
    1563, Munzbuch.
    Further Reading
    P.R.Beierlein, 1955, Lazarus Ercker, Bergmann, Hüttenmann und Münzmeister im 16. Jahrhundert, Berlin (the best biography, although the chemical details are incomplete).
    J.R.Partington, 1961, History of Chemistry, London, Vol. II, pp. 104–7.
    E.V.Armstrong and H.Lukens, 1939, "Lazarus Ercker and his Probierbuch", J.Chem. Ed.
    16: 553–62.
    LRD

    Biographical history of technology > Ercker, Lazarus

  • 20 Polhem, Christopher

    [br]
    b. 18 December 1661 Tingstade, Gotland, Sweden d. 1751
    [br]
    Swedish engineer and inventor.
    [br]
    He was the eldest son of Wolf Christopher Polhamma, a merchant. The father died in 1669 and the son was sent by his stepfather to an uncle in Stockholm who found him a place in the Deutsche Rechenschule. After the death of his uncle, he was forced to find employment, which he did with the Biorenklou family near Uppsala where he eventually became a kind of estate bailiff. It was during this period that he started to work with a lathe, a forge and at carpentry, displaying great technical ability. He realized that without further education he had little chance of making anything of his life, and accordingly, in 1687, he registered at the University of Uppsala where he studied astronomy and mathematics, remaining there for three years. He also repaired two astronomical pendulum clocks as well as the decrepit medieval clock in the cathedral. After a year's work he had this clock running properly: this was his breakthrough. He was summoned to Stockholm where the King awarded him a salary of 500 dalers a year as an encouragement to further efforts. Around this time, one of increasing mechanization and when mining was Sweden's principal industry, Pohlem made a model of a hoist frame for mines and the Mines Authority encouraged him to develop his ideas. In 1693 Polhem completed the Blankstot hoist at the Stora Kopparberg mine, which attracted great interest on the European continent.
    From 1694 to 1696 Polhem toured factories, mills and mines abroad in Germany, Holland, England and France, studying machinery of all kinds and meeting many foreign engineers. In 1698 he was appointed Director of Mining Engineering in Sweden, and in 1700 he became Master of Construction in the Falu Mine. He installed the Karl XII hoist there, powered by moving beams from a distant water-wheel. His plan of 1697 for all the machinery at the Falu mine to be driven by three large and remote water-wheels was never completed.
    In 1707 he was invited by the Elector of Hanover to visit the mines in the Harz district, where he successfully explained many of his ideas which were adopted by the local engineers. In 1700, in conjunction with Gabriel Stierncrona, he founded the Stiersunds Bruk at Husby in Southern Dalarna, a factory for the mass production of metal goods in iron, steel and bronze. Simple articles such as pans, trays, bowls, knives, scissors and mirrors were made there, together with the more sophisticated Polhem lock and the Stiersunds clock. Production was based on water power. Gear cutting for the clocks, shaping hammers for plates, file cutting and many other operations were all water powered, as was a roller mill for the sheet metal used in the factory. He also designed textile machinery such as stocking looms and spinning frames and machines for the manufacture of ribbons and other things.
    In many of his ideas Polhem was in advance of his time and Swedish country society was unable to absorb them. This was largely the reason for the Stiersund project being only a partial success. Polhem, too, was of a disputatious nature, self-opinionated almost to the point of conceit. He was a prolific writer, leaving over 20,000 pages of manuscript notes, drafts, essays on a wide range of subjects, which included building, brick-making, barrels, wheel-making, bell-casting, organ-building, methods of stopping a horse from bolting and a curious tap "to prevent serving maids from sneaking wine from the cask", the construction of ploughs and threshing machines. His major work, Kort Berattelse om de Fornamsta Mechaniska Inventioner (A Brief Account of the Most Famous Inventions), was printed in 1729 and is the main source of knowledge about his technological work. He is also known for his "mechanical alphabet", a collection of some eighty wooden models of mechanisms for educational purposes. It is in the National Museum of Science and Technology in Stockholm.
    [br]
    Bibliography
    1729, Kort Berattelse om de Fornamsta Mechaniska Inventioner (A Brief Account of the Most Famous Inventions).
    Further Reading
    1985, Christopher Polhem, 1661–1751, TheSwedish Daedalus' (catalogue of a travelling exhibition from the Swedish Institute in association with the National Museum of Science and Technology), Stockholm.
    IMcN

    Biographical history of technology > Polhem, Christopher

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