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1 London
London ['lʌndən]1 nounLondres►► the London Academy of Music and Dramatic Art = conservatoire de musique et d'art dramatique, à Londres;London Bridge = pont construit sur la Tamise en 1968 pour remplacer l'ancien pont, qui fut vendu et remonté dans l'Arizona;the London Coliseum = théâtre londonien, siège du "English National Opera";the London Eye = la grande roue construite à Londres pour le nouveau millénaire;Finance London Inter-Bank Offer Rate ≃ taux interbancaire offert à Paris;Finance the London International Financial Futures Exchange = marché à terme britannique d'instruments financiers, ≃ MATIF m;the London Palladium = théâtre londonien connu pour ses spectacles de variétés;Botany London pride saxifrage f à feuilles en coin, mignonnette f;London (Regional) Transport = régie des transports publics londoniens;University London School of Economics = grande école de sciences économiques et politiques à Londres;the London Season = série de manifestations mondaines, courses hippiques etc organisées chaque année à Londres et dans les alentours;Stock Exchange the London Stock Exchange = la Bourse de Londres;Music the London Symphony Orchestra = orchestre symphonique de Londres;British London weighting = indemnité de vie chère venant compléter certains salaires londoniens -
2 Wollaston, William Hyde
SUBJECT AREA: Metallurgy[br]b. 6 August 1766 East Dereham, Norfolk, Englandd. 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 DistinctionsFRS 1793.BibliographyHis scientific papers were published in various journals, nearly all listed in the Royal Society Catalogue of Scientific Papers.Further ReadingThere is no good general biography, the best general account being the entry inDictionary 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.ASDBiographical history of technology > Wollaston, William Hyde
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3 Johnson, Percival Norton
SUBJECT AREA: Metallurgy[br]b. 29 September 1792 London, Englandd. 1 June 1866 Stoke Fleming, Devon, England[br]English chemist, assayer, mining engineer and founder of the firm Johnson Matthey.[br]He was the son of John Johnson, then sole Commercial Assayer in London, from whom he inherited his aptitude for chemistry and metallurgy. At the age of 14 he was apprenticed to his father by the Worshipful Company of Goldsmiths. Ore samples then being analysed in Johnson's office introduced him to the new metal platinum, and resulted in a paper to Philosophical Magazine in 1812. Johnson established himself as a "practical mineralogist" in Maiden Lane, London, in 1818 and in Hatton Garden after 1822. He was greatly assisted by a fellow metallurgist, Thomas Cock (1787–1842), who developed the platinum fabrication and pigment sides of die business. In 1827 Johnson was consulted by the Russian government about the exploitation of the rich platinum deposits that had been discovered in the Urals in 1819. Between 1829 and 1832 Johnson became the first in England to manufacture nickel, extracted from nickel-bearing material imported from Germany at his plant at Bow Common on the Regent's Canal. In 1832 he began to réfine gold imported from the Imperial Brazilian Association by a process which separated without loss the metals silver, platinum, palladium, rhodium and iridium. This profitable activity continued until the Brazilian company was wound up in 1852. Since 1824, Johnson had been named "assay master" by a number of mining companies. From 1843 until the mid-1850s he had a considerable mining interest in the West Country. Meanwhile, the Hatton Garden establishment continued to prosper. In 1839 he was joined by George Matthey, who particularly fostered the Russian platinum business, and in 1851 he was taken unto partnership and the firm became the celebrated Johnson Matthey. In the following year the firm was officially recognized as one of the four Assayers to the Bank of England appointed to handle the flood of gold dust then arriving in England from the Australian gold fields. Soon after, however, ill health compelled him to retire to his Devon country house.[br]Principal Honours and DistinctionsFRS 1846.Bibliography1812, "Experiments which prove platina, when combined with gold and silver, to be soluble in nitric acid", Philosophical Magazine (1st series) 40(171):3–4.Further ReadingD.McDonald, 1951, Percival Norton Johnson, London: Johnson Matthey (includes lists of his publications and his honours and awards).——1964, The Johnsons of Morden Lane, London: Martins.——1960, A History of Platinum, London: Johnson Matthey.ASDBiographical history of technology > Johnson, Percival Norton
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