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1 Poor Law Institution
Cartography: PL InstnУниверсальный русско-английский словарь > Poor Law Institution
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2 Public Assistance Institution
Универсальный русско-английский словарь > Public Assistance Institution
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3 institution
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4 instruction
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5 instrument
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6 instrumentation
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7 Guinand, Pierre Louis
SUBJECT AREA: Photography, film and optics[br]b. 20 April 1748 Brenets, Neuchâtel, Switzerlandd. 13 February 1824 Brenets, Neuchâtel, Switzerland[br]Swiss optical glassmaker.[br]Guinand received little formal education and followed his father's trade of joiner. He specialized in making clock cases, but after learning how to cast metals he took up the more lucrative work of making watch cases. When he was about 20 years old, in a customer's house he caught sight of an English telescope, a rarity in a Swiss mountain village. Intrigued, he obtained permission to examine it. This aroused his interest in optical matters and he began making spectacles and small telescopes.Achromatic lenses were becoming known, their use being to remove the defect of chromatic aberration or coloured optical images, but there remained defects due to imperfections in the glass itself. Stimulated by offers of prizes by scientific bodies, including the Royal Society of London, for removing these defects, Guinand set out to remedy them. He embarked in 1784 on a long and arduous series of experiments, varying the materials and techniques for making glass. The even more lucrative trade of making bells for repeaters provided the funds for a furnace capable of holding 2 cwt (102 kg) of molten glass. By 1798 or so he had succeeded in making discs of homogeneous glass. He impressed the famous Parisian astronomer de Lalande with them and his glass became well enough known for scientists to visit him. In 1805 Fraunhofer persuaded Guinand to join his optical-instrument works at Benediktheurn, in Bavaria, to make lenses. After nine years, Guinand returned to Brenets with a pension, on condition he made no more glass and disclosed no details of his methods. After two years these conditions had become irksome and he relinquished the pension. On 19 February 1823 Guinand described his discoveries in his classic "Memoir on the making of optical glass, more particularly of glass of high refractive index for use in the production of achromatic lenses", presented to the Société de Physique et d'Histoire Naturelle de Genève. This gives details of his experiments and investigations and discusses a suitable pot-clay stirrer and stirring mechanism for the molten glass, with temperature control, to overcome optical-glass defects such as bubbles, seeds, cords and colours. Guinand was hailed as the man in Europe who had achieved this and has thus rightly been called the founder of the era of optical glassmaking.[br]Further ReadingThe fullest account in English of Guinand's life and work is 'Some account of the late M. Guinand and of the discovery made by him in the manufacture of flint glass for large telescopes by F.R., extracted from the Bibliothèque Universelle des Sciences, trans.C.F.de B.', Quart.J.Sci.Roy.Instn.Lond. (1825) 19: 244–58.M.von Rohr, 1924, "Pierre Louis Guinand", Zeitschrift für Instr., 46:121, 139, with an English summary in J.Glass. Tech., (1926) 10: abs. 150–1.LRD -
8 Neilson, James Beaumont
SUBJECT AREA: Metallurgy[br]b. 22 June 1792 Shettleston, near Glasgow, Scotlandd. 18 January 1865 Queenshill, Kirkcudbright-shire, Scotland[br]Scottish inventor of hot blast in ironmaking.[br]After leaving school before the age of 14 Neilson followed his father in tending colliery-steam engines. He continued in this line while apprenticed to his elder brother and afterwards rose to engine-wright at Irvine colliery. That failed and Neilson obtained work as Foreman at the first gasworks to be set up in Glasgow. After five years he became Manager and Engineer to the works, remaining there for thirty years. He introduced a number of improvements into gas manufacture, such as the use of clay retorts, iron sulphate as a purifier and the swallow-tail burner. He had meanwhile benefited from studying physics and chemistry at the Andersonian University in Glasgow.Neilson is best known for introducing hot blast into ironmaking. At that time, ironmasters believed that cold blast produced the best results, since furnaces seemed to make more and better iron in the winter than the summer. Neilson found that by leading the air blast through an iron chamber heated by a coal fire beneath it, much less fuel was needed to convert the iron ore to iron. He secured a patent in 1828 and managed to persuade Clyde Ironworks in Glasgow to try out the device. The results were immediately favourable, and the use of hot blast spread rapidly throughout the country and abroad. The equipment was improved, raising the blast temperature to around 300°C (572°F), reducing the amount of coal, which was converted into coke, required to produce a tonne of iron from 10 tonnes to about 3. Neilson entered into a partnership with Charles Macintosh and others to patent and promote the process. Successive, and successful, lawsuits against those who infringed the patent demonstrates the general eagerness to adopt hot blast. Beneficial though it was, the process did not become really satisfactory until the introduction of hot-blast stoves by E.A. Cowper in 1857.[br]Principal Honours and DistinctionsFRS 1846.Further ReadingS.Smiles, Industrial Biography, Ch. 9 (offers the most detailed account of Neilson's life). Proc. Instn. Civ. Engrs., vol. 30, p. 451.J.Percy, 1851, Metallurgy: Iron and Steel (provides a detailed history of hot blast).W.K.V.Gale, 1969, Iron and Steel, London: Longmans (provides brief details).LRDBiographical history of technology > Neilson, James Beaumont
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