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21 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 -
22 Lucas, Anthony Francis
SUBJECT AREA: Mining and extraction technology[br]b. 9 September 1855 Spalato, Dalmatia, Austria-Hungary (now Split, Croatia)d. 2 September 1921 Washington, DC, USA[br]Austrian (naturalized American) mining engineer who successfully applied rotary drilling to oil extraction.[br]A former Second Lieutenant of the Austrian navy (hence his later nickname "Captain") and graduate of the Polytechnic Institute of Graz, Lucas decided to stay in Michigan when he visited his relatives in 1879. He changed his original name, Lucie, into the form his uncle had adopted and became a naturalized American citizen at the age of 30. He worked in the lumber industry for some years and then became a consulting mechanical and mining engineer in Washington, DC. He began working for a salt-mining company in Louisiana in 1893 and became interested in the geology of the Mexican Gulf region, with a view to prospecting for petroleum. In the course of this work he came to the conclusion that the hills in this elevated area, being geological structures distinct from the surrounding deposits, were natural reservoirs of petroleum. To prove his unusual theory he subsequently chose Spindle Top, near Beaumont, Texas, where in 1899 he began to bore a first oil-well. A second drill-hole, started in October 1900, was put through clay and quicksand. After many difficulties, a layer of rock containing marine shells was reached. When the "gusher" came out on 10 January 1901, it not only opened up a new era in the oil and gas business, but it also led to the future exploration of the terrestrial crust.Lucas's boring was a breakthrough for the rotary drilling system, which was still in its early days although its principles had been established by the English engineer Robert Beart in his patent of 1884. It proved to have advantages over the pile-driving of pipes. A pipe with a simple cutter at the lower end was driven with a constantly revolving motion, grinding down on the bottom of the well, thus gouging and chipping its way downward. To deal with the quicksand he adopted the use of large and heavy casings successively telescoped one into the other. According to Fauvelle's method, water was forced through the pipe by means of a pump, so the well was kept full of circulating liquid during drilling, flushing up the mud. When the salt-rock was reached, a diamond drill was used to test the depth and the character of the deposit.When the well blew out and flowed freely he developed a preventer in order to save the oil and, even more importantly at the time, to shut the well and to control the oil flow. This assembly, patented in 1903, consisted of a combined system of pipes, valves and casings diverting the stream into a horizontal direction.Lucas's fame spread around the world, but as he had to relinquish the larger part of his interest to the oil company supporting the exploration, his financial reward was poor. One year after his success at Spindle Top he started oil exploration in Mexico, where he stayed until 1905, when he resumed his consulting practice in Washington, DC.[br]Bibliography1899, "Rock-salt in Louisiana", Transactions of the American Institution of Mining Engineers 29:462–74.1902, "The great oil-well near Beaumont, Texas", Transactions of the AmericanInstitution of Mining Engineers 31:362–74.Further ReadingR.S.McBeth, 1918, Pioneering the Gulf Coast, New York (a very detailed description of Lucas's important accomplishments in the development of the oil industry).R.T.Hill, 1903, "The Beaumont oil-field, with notes on other oil-fields of the Texas region", Transactions of the American Institution of Mining Engineers 33:363–405;Transactions of the American Institution of Mining Engineers 55:421–3 (contain shorter biographical notes).WK -
23 Wedgwood, Josiah
SUBJECT AREA: Domestic appliances and interiors[br]baptized 12 July 1730 Burslem, Staffordshire, Englandd. 3 January 1795 Etruria Hall, Staffordshire, England[br]English potter and man of science.[br]Wedgwood came from prolific farming stock who, in the seventeenth century, had turned to pot-making. At the age of 9 his education was brought to an end by his father's death and he was set to work in one of the family potteries. Two years later an attack of smallpox left him with a weakness in his right knee which prevented him from working the potter's wheel. This forced his attention to other aspects of the process, such as design and modelling. He was apprenticed to his brother Thomas in 1744, and in 1752 was in partnership with Thomas Whieldon, a leading Staffordshire potter, until probably the first half of 1759, when he became a master potter and set up in business on his own account at Ivy House Works in Burslem.Wedgwood was then able to exercise to the full his determination to improve the quality of his ware. This he achieved by careful attention to all aspects of the work: artistic judgement of form and decoration; chemical study of the materials; and intelligent management of manufacturing processes. For example, to achieve greater control over firing conditions, he invented a pyrometer, a temperature-measuring device by which the shrinkage of prepared clay cylinders in the furnace gave an indication of the temperature. Wedgwood was the first potter to employ steam power, installing a Boulton \& Watt engine for crushing and other operations in 1782. Beyond the confines of his works, Wedgwood concerned himself in local issues such as improvements to the road and canal systems to facilitate transport of raw materials and products.During the first ten years, Wedgwood steadily improved the quality of his cream ware, known as "Queen's ware" after a set of ware was presented to Queen Charlotte in 1762. The business prospered and his reputation grew. In 1766 he was able to purchase an estate on which he built new works, a mansion and a village to which he gave the name Etruria. Four years after the Etruria works were opened in 1769, Wedgwood began experimenting with a barium compound combined in a fine-textured base allied to a true porcelain. The result was Wedgwood's most original and distinctive ware similar to jasper, made in a wide variety of forms.Wedgwood had many followers and imitators but the merit of initiating and carrying through a large-scale technical and artistic development of English pottery belongs to Wedgwood.[br]Principal Honours and DistinctionsFRS 1783.BibliographyWedgwood contributed five papers to the Philosophical Transactions of the Royal Society, two in 1783 and 1790 on chemical subjects and three in 1782, 1784 and 1786 on his pyrometer.Further ReadingMeteyard, 1865, Life of Josiah Wedgwood, London (biography).A.Burton, 1976, Josiah Wedgwood: Biography, London: André Deutsch (a very readable account).LRD -
24 ножницы стабилизатора
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