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61 unfranked investment income
(U.K.) Finamounts received by a company net of basic rate tax, for example, patent royaltiesThe ultimate business dictionary > unfranked investment income
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62 Diesel, Rudolph Christian Karl
SUBJECT AREA: Steam and internal combustion engines[br]b. 1858 Paris, Franced. 1913 at sea, in the English Channel[br]German inventor of the Diesel or Compression Ignition engine.[br]A German born in Paris, he was educated in Augsburg and later in Munich, where he graduated first in his class. There he took some courses under Professor Karl von Linde, pioneer of mechanical refrigeration and an authority on thermodynamics, who pointed out the low efficiency of the steam engine. He went to work for the Linde Ice Machine Company as an engineer and later as Manager; there he conceived a new basic cycle and worked out its thermodynamics, which he published in 1893 as "The theory and construction of a rational heat motor". Compressing air adiabatically to one-sixteenth of its volume caused the temperature to rise to 1,000°F (540°C). Injected fuel would then ignite automatically without any electrical system. He obtained permission to use the laboratories of the Augsburg-Nuremburg Engine Works to build a single-cylinder prototype. On test it blew up, nearly killing Diesel. He proved his principle, however, and obtained financial support from the firm of Alfred Krupp. The design was refined until successful and in 1898 an engine was put on display in Munich with the result that many business people invested in Diesel and his engine and its worldwide production. Diesel made over a million dollars out of the invention. The heart of the engine is the fuel-injection pump, which operates at a pressure of c.500 psi (35 kg/cm). The first English patent for the engine was in 1892. The firms in Augsburg sent him abroad to sell his engine; he persuaded the French to adopt it for submarines, Germany having refused this. Diesel died in 1913 in mysterious circumstances, vanishing from the Harwich-Antwerp ferry.[br]Further ReadingE.Diesel, 1937, Diesel, derMensch, das Werk, das Schicksal, Hamburg. J.S.Crowther, 1959, Six Great Engineers, London.John F.Sandfort, 1964, Heat Engines.IMcNBiographical history of technology > Diesel, Rudolph Christian Karl
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63 Ducos du Hauron, Arthur-Louis
SUBJECT AREA: Photography, film and optics[br]b. 1837 Langon, Bordeaux, Franced. 19 August 1920 Agen, France[br]French scientist and pioneer of colour photography.[br]The son of a tax collector, Ducos du Hauron began researches into colour photography soon after the publication of Clerk Maxwell's experiment in 1861. In a communication sent in 1862 for presentation at the Académie des Sciences, but which was never read, he outlined a number of methods for photography of colours. Subsequently, in his book Les Couleurs en photographie, published in 1869, he outlined most of the principles of additive and subtractive colour photography that were later actually used. He covered additive processes, developed from Clerk Maxwell's demonstrations, and subtractive processes which could yield prints. At the time, the photographic materials available prevented the processes from being employed effectively. The design of his Chromoscope, in which transparent reflectors could be used to superimpose three additive images, was sound, however, and formed the basis of a number of later devices. He also proposed an additive system based on the use of a screen of fine red, yellow and blue lines, through which the photograph was taken and viewed. The lines blended additively when seen from a certain distance. Many years later, in 1907, Ducos du Hauron was to use this principle in an early commercial screen-plate process, Omnicolore. With his brother Alcide, he published a further work in 1878, Photographie des Couleurs, which described some more-practical subtractive processes. A few prints made at this time still survive and they are remarkably good for the period. In a French patent of 1895 he described yet another method for colour photography. His "polyfolium chromodialytique" involved a multiple-layer package of separate red-, green-and blue-sensitive materials and filters, which with a single exposure would analyse the scene in terms of the three primary colours. The individual layers would be separated for subsequent processing and printing. In a refined form, this is the principle behind modern colour films. In 1891 he patented and demonstrated the anaglyph method of stereoscopy, using superimposed red and green left and right eye images viewed through green and red filters. Ducos du Hauron's remarkable achievement was to propose theories of virtually all the basic methods of colour photography at a time when photographic materials were not adequate for the purpose of proving them correct. For his work on colour photography he was awarded the Progress Medal of the Royal Photographic Society in 1900, but despite his major contributions to colour photography he remained in poverty for much of his later life.[br]Further ReadingB.Coe, 1978, Colour Photography: The First Hundred Years, London. J.S.Friedman, 1944, History of Colour Photography, Boston. E.J.Wall, 1925, The History of Three-Colour Photography, Boston. See also Cros, Charles.BCBiographical history of technology > Ducos du Hauron, Arthur-Louis
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64 Farnsworth, Philo Taylor
[br]b. 19 August 1906 Beaver, Utah, USAd. 11 March 1971 Salt Lake City, Utah, USA[br]American engineer and independent inventor who was a pioneer in the development of television.[br]Whilst still in high school, Farnsworth became interested in the possibility of television and conceived many of the basic features of a practicable system of TV broadcast and reception. Following two years of study at the Brigham Young University in Provo, Utah, in 1926 he cofounded the Crocker Research Laboratories in San Francisco, subsequently Farnsworth Television Inc. (1929) and Farnsworth Radio \& Television Corporation, Fort Wayne, Indiana (1938). There he began a lifetime of research, primarily in the field of television. In 1927, with the backing of the Radio Corporation of America (RCA) and the collaboration of Vladimir Zworykin, he demonstrated the first all-electronic television system, based on his early ideas for an image dissector tube, the first electronic equivalent of the Nipkow disc. With this rudimentary sixty-line system he was able to transmit a recognizable dollar sign and file the first of many TV patents. From then on he contributed to a variety of developments in the fields of vacuum tubes, radar and atomic-power generation, with patents on cathode ray tubes, amplifying and pick-up tubes, electron multipliers and photoelectric materials.[br]Principal Honours and DistinctionsInstitute of Radio Engineers Morris Leibmann Memorial Prize 1941.Bibliography1930, British patent nos. 368,309 and 368,721 (for his image dissector).1934, "Television by electron image scanning", Journal of the Franklin Institute 218:411 (describes the complete image-dissector system).Further ReadingJ.H.Udelson, 1982, The Great Television Race: A History of the American Television Industry 1925–1941, University of Alabama Press.O.E.Dunlop Jr, 1944, Radio's 100 Men of Science.G.R.M.Garratt \& A.H.Mumford, 1952, "The history of television", Proceedings of the Institution of Electrical Engineers III A Television 99.KFBiographical history of technology > Farnsworth, Philo Taylor
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65 Gillott, Joseph
SUBJECT AREA: Paper and printing[br]b. 1799 Sheffield, Yorkshire d. 1877[br]English maker of steel pens.[br]The name Joseph Gillott became synonymous with pen making at a time when the basic equipment for writing was undergoing a change. The quill pen had served writers for centuries, but attempts had been made since the seventeenth century to improve on it. The first major technical development was the steel nib, which began to be made c.1829. The steel nib was still little known in Birmingham in 1839, but ten years later it was in common use. Its stiffness was at first a drawback, but Gillott was among the first to improve its flexibility by introducing three slots, which later became standard practice. Mechanical methods of manufacture made the pen cheaper and improved its quality. In 1840 Gillott issued a "precept" informing the public that he was pen maker to the Queen and that he had been manufacturing pens for twenty years at his Victoria Works in Birmingham. He announced the successful reception by the public of his new patent pen. There were also special "warranted school" pens designed for the various grades of writing taught in schools. Finally, he warned against inferior imitations and recommended the public to buy only those pens stamped with his name.[br]Further ReadingJ.T.Bunce and S.Timmins, c.1880 Joseph Gillott 1799–1877: A Sketch of His Life.H.Bore, 1890, The Story of the Invention of the Steel Pen, London.J.Whalley, 1975, Writing Implements and Accessories, Newton Abbot: David \& Charles.LRD -
66 Jacquard, Joseph-Marie
SUBJECT AREA: Textiles[br]b. 7 July 1752 Lyons, Franced. 7 August 1834 Oullines, France[br]French developer of the apparatus named after him and used for selecting complicated patterns in weaving.[br]Jacquard was apprenticed at the age of 12 to bookbinding, and later to type-founding and cutlery. His parents, who had some connection with weaving, left him a small property upon their death. He made some experiments with pattern weaving, but lost all his inheritance; after marrying, he returned to type-founding and cutlery. In 1790 he formed the idea for his machine, but it was forgotten amidst the excitement of the French Revolution, in which he fought for the Revolutionists at the defence of Lyons. The machine he completed in 1801 combined earlier inventions and was for weaving net. He was sent to Paris to demonstrate it at the National Exposition and received a bronze medal. In 1804 Napoleon granted him a patent, a pension of 1,500 francs and a premium on each machine sold. This enabled him to study and work at the Conservatoire des Arts et Métiers to perfect his mechanism for pattern weaving. A method of selecting any combination of leashes at each shoot of the weft had to be developed, and Jacquard's mechanism was the outcome of various previous inventions. By taking the cards invented by Falcon in 1728 that were punched with holes like the paper of Bouchon in 1725, to select the needles for each pick, and by placing the apparatus above the loom where Vaucanson had put his mechanism, Jacquard combined the best features of earlier inventions. He was not entirely successful because his invention failed in the way it pressed the card against the needles; later modifications by Breton in 1815 and Skola in 1819 were needed before it functioned reliably. However, the advantage of Jacquard's machine was that each pick could be selected much more quickly than on the earlier draw looms, which meant that John Kay's flying shuttle could be introduced on fine pattern looms because the weaver no longer had to wait for the drawboy to sort out the leashes for the next pick. Robert Kay's drop box could also be used with different coloured wefts. The drawboy could be dispensed with because the foot-pedal operating the Jacquard mechanism could be worked by the weaver. Patterns could be changed quickly by replacing one set of cards with another, but the scope of the pattern was more limited than with the draw loom. Some machines that were brought into use aroused bitter hostility. Jacquard suffered physical violence, barely escaping with his life, and his machines were burnt by weavers at Lyons. However, by 1812 his mechanism began to be generally accepted and had been applied to 11,000 draw-looms in France. In 1819 Jacquard received a gold medal and a Cross of Honour for his invention. His machines reached England c.1816 and still remain the basic way of weaving complicated patterns.[br]Principal Honours and DistinctionsFrench Cross of Honour 1819. National Exposition Bronze Medal 1801.Further ReadingA.Barlow, 1878, The History and Principles of Weaving by Hand and by Power, London.C.Singer (ed.), 1958, A History of Technology, Vol. IV, Oxford: Clarendon Press.R.L.Hills, 1970, Power in the Industrial Revolution, Manchester (covers the introduction of pattern weaving and the power loom).RLH -
67 Kaplan, Viktor
[br]b. 27 November 1876 Mutz, Austriad. 23 August 1834 Unterach, Austria[br]Austrian engineer, inventor of the Kaplan turbine.[br]Kaplan was educated at the Realschule in Vienna and went on to the Technische Hochschule to study machine construction, gaining his engineer's diploma in 1900. He spent a year in voluntary service in the Navy before entering Ganz \& Co. at Lebersdorf, where he was engaged in the manufacture of diesel engines. In 1903 he turned to an academic career, first with a professorship in kinematics, theoretical machine studies and machine construction at the Technische Hochschule in Brunn (now Brno). In 1918 he became Professor of Water Turbine Construction, remaining as such until his early retirement for health reasons in 1931.Kaplan's first publication on turbines, in 1908, was an extension of work carried out for his doctorate at the Technische Hochschule in Vienna and concerned the Francis-type turbine. Kaplan went on to develop and patent the form of water turbine that came to bear his name. It is a reaction turbine which uses a large flow on a low head and which is made like a ship's propeller with variable-pitch vanes running in a close-fitting casing. Its application was neglected at first, but since the 1920s it has become the basic turbine for most high-powered hydroelectric plant: the turbines have been capable of around 85 per cent efficiency and modern developments have raised this figure still further. Perhaps the most impressive application of the Kaplan turbine and its derivatives is the great tidal-power scheme in the estuary of the Rance by St-Malo in France, completed in 1966. The turbines probably have to meet a greater demand for flexibility than any others, for they must operate at constant speed with variable head, as the tide ebbs and flows.LRD -
68 Lee, Revd William
SUBJECT AREA: Textiles[br]d. c. 1615[br]English inventor of the first knitting machine, called the stocking frame.[br]It would seem that most of the stories about Lee's invention of the stocking frame cannot be verified by any contemporary evidence, and the first written accounts do not appear until the second half of the seventeenth century. The claim that he was Master of Arts from St John's College, Cambridge, was first made in 1607 but cannot be checked because the records have not survived. The date for the invention of the knitting machine as being 1589 was made at the same time, but again there is no supporting evidence. There is no evidence that Lee was Vicar of Calverton, nor that he was in Holy Orders at all. Likewise there is no evidence for the existence of the woman, whether she was girlfriend, fiancée or wife, who is said to have inspired the invention, and claims regarding the involvement of Queen Elizabeth I and her refusal to grant a patent because the stockings were wool and not silk are also without contemporary foundation. Yet the first known reference shows that Lee was the inventor of the knitting machine, for the partnership agreement between him and George Brooke dated 6 June 1600 states that "William Lee hath invented a very speedy manner of making works usually wrought by knitting needles as stockings, waistcoats and such like". This agreement was to last for twenty-two years, but terminated prematurely when Brooke was executed for high treason in 1603. Lee continued to try and exploit his invention, for in 1605 he described himself as "Master of Arts" when he petitioned the Court of Aldermen of the City of London as the first inventor of an engine to make silk stockings. In 1609 the Weavers' Company of London recorded Lee as "a weaver of silk stockings by engine". These petitions suggest that he was having difficulty in establishing his invention, which may be why in 1612 there is a record of him in Rouen, France, where he hoped to have better fortune. If he had been invited there by Henry IV, his hopes were dashed by the assassination of the king soon afterwards. He was to supply four knitting machines, and there is further evidence that he was in France in 1615, but it is thought that he died in that country soon afterwards.The machine Lee invented was probably the most complex of its day, partly because the need to use silk meant that the needles were very fine. Henson (1970) in 1831 took five pages in his book to describe knitting on a stocking frame which had over 2,066 pieces. To knit a row of stitches took eleven separate stages, and great care and watchfulness were required to ensure that all the loops were equal and regular. This shows how complex the machines were and points to Lee's great achievement in actually making one. The basic principles of its operation remained unaltered throughout its extraordinarily long life, and a few still remained in use commercially in the early 1990s.[br]Further ReadingJ.T.Millington and S.D.Chapman (eds), 1989, Four Centuries of Machine Knitting, Commemorating William Lee's Invention of the Stocking Frame in 1589, Leicester (N.Harte examines the surviving evidence for the life of William Lee and this must be considered as the most up-to-date biographical information).Dictionary of National Biography (this contains only the old stories).Earlier important books covering Lee's life and invention are G.Henson, 1970, History of the Framework Knitters, reprint, Newton Abbot (orig. pub. 1831); and W.Felkin, 1967, History of the Machine-wrought Hosiery and Lace Manufactures, reprint, Newton Abbot (orig. pub. 1867).M.Palmer, 1984, Framework Knitting, Aylesbury (a simple account of the mechanism of the stocking frame).R.L.Hills, "William Lee and his knitting machine", Journal of the Textile Institute 80(2) (a more detailed account).M.Grass and A.Grass, 1967, Stockings for a Queen. The Life of William Lee, the Elizabethan Inventor, London.RLH -
69 Monell, Ambrose
SUBJECT AREA: Metallurgy[br]b. 1874 New York, USAd. 2 May 1921 Beacon, New York, USA[br]American metallurgist who gave his name to a successful nickel-copper alloy.[br]After graduating from Columbia University in 1896. Monell became a metallurgical engineer to the Carnegie Steel Company, rising in six years to be Assistant to the President. In 1900, while Manager of the company's open-hearth steelworks at Pittsburg, he patented a procedure for making high-carbon steel in basic conditions on the hearth of a fixed/stationary furnace; the method was intended to refine pig-iron containing substantial proportions of phosphorus and to do so relatively quickly. The process was introduced at the Homestead Works of the Carnegie Steel Company in February 1900, where it continued in use for some years. In April 1902 Monell was among those who launched the International Nickel Company of New Jersey in order to bring together a number of existing nickel interests; he became the new company's President. In 1904–5, members of the company's metallurgical staff produced an alloy of about 70 parts nickel and 30 copper which seemed to show great commercial promise on account of its high resistance to corrosion and its good appearance. Monell agreed to the suggestion that the new alloy should be given his name; for commercial reasons it was marketed as "Monel metal". In 1917, following the entry of the USA into the First World War, Monell was commissioned Colonel in the US Army (Aviation) for overseas service, relinquishing his presidency of the International Nickel Company but remaining as a director. At the time of his death he was also a director in several other companies in the USA.[br]Bibliography1900, British patent no. 5506 (taken out by O. Imray on behalf of Monell).Monell insinuated an account of his steel-making procedure at a meeting of the Iron and Steel Institute held in London and reported in The Journal of the Iron and SteelInstitute (1900) 1:71–80; some of the comments made by other speakers, particularly B.Talbot, were adverse. The following year (1901) Monell produced a general historical review: "A summary of development in open-hearth steel", Iron TradeReview 14(14 November):39–47.Further ReadingA.J.Wadhams, 1931, "The story of the nickel industry", Metals and Alloys 2(3):166–75 (mentions Monell among many others, and includes a portrait (p. 170)).JKA -
70 Nobel, Immanuel
[br]b. 1801 Gävle, Swedend. 3 September 1872 Stockholm, Sweden[br]Swedish inventor and industrialist, particularly noted for his work on mines and explosives.[br]The son of a barber-surgeon who deserted his family to serve in the Swedish army, Nobel showed little interest in academic pursuits as a child and was sent to sea at the age of 16, but jumped ship in Egypt and was eventually employed as an architect by the pasha. Returning to Sweden, he won a scholarship to the Stockholm School of Architecture, where he studied from 1821 to 1825 and was awarded a number of prizes. His interest then leaned towards mechanical matters and he transferred to the Stockholm School of Engineering. Designs for linen-finishing machines won him a prize there, and he also patented a means of transforming rotary into reciprocating movement. He then entered the real-estate business and was successful until a fire in 1833 destroyed his house and everything he owned. By this time he had married and had two sons, with a third, Alfred (of Nobel Prize fame; see Alfred Nobel), on the way. Moving to more modest quarters on the outskirts of Stockholm, Immanuel resumed his inventions, concentrating largely on India rubber, which he applied to surgical instruments and military equipment, including a rubber knapsack.It was talk of plans to construct a canal at Suez that first excited his interest in explosives. He saw them as a means of making mining more efficient and began to experiment in his backyard. However, this made him unpopular with his neighbours, and the city authorities ordered him to cease his investigations. By this time he was deeply in debt and in 1837 moved to Finland, leaving his family in Stockholm. He hoped to interest the Russians in land and sea mines and, after some four years, succeeded in obtaining financial backing from the Ministry of War, enabling him to set up a foundry and arms factory in St Petersburg and to bring his family over. By 1850 he was clear of debt in Sweden and had begun to acquire a high reputation as an inventor and industrialist. His invention of the horned contact mine was to be the basic pattern of the sea mine for almost the next 100 years, but he also created and manufactured a central-heating system based on hot-water pipes. His three sons, Ludwig, Robert and Alfred, had now joined him in his business, but even so the outbreak of war with Britain and France in the Crimea placed severe pressures on him. The Russians looked to him to convert their navy from sail to steam, even though he had no experience in naval propulsion, but the aftermath of the Crimean War brought financial ruin once more to Immanuel. Amongst the reforms brought in by Tsar Alexander II was a reliance on imports to equip the armed forces, so all domestic arms contracts were abruptly cancelled, including those being undertaken by Nobel. Unable to raise money from the banks, Immanuel was forced to declare himself bankrupt and leave Russia for his native Sweden. Nobel then reverted to his study of explosives, particularly of how to adapt the then highly unstable nitroglycerine, which had first been developed by Ascanio Sobrero in 1847, for blasting and mining. Nobel believed that this could be done by mixing it with gunpowder, but could not establish the right proportions. His son Alfred pursued the matter semi-independently and eventually evolved the principle of the primary charge (and through it created the blasting cap), having taken out a patent for a nitroglycerine product in his own name; the eventual result of this was called dynamite. Father and son eventually fell out over Alfred's independent line, but worse was to follow. In September 1864 Immanuel's youngest son, Oscar, then studying chemistry at Uppsala University, was killed in an explosion in Alfred's laboratory: Immanuel suffered a stroke, but this only temporarily incapacitated him, and he continued to put forward new ideas. These included making timber a more flexible material through gluing crossed veneers under pressure and bending waste timber under steam, a concept which eventually came to fruition in the form of plywood.In 1868 Immanuel and Alfred were jointly awarded the prestigious Letterstedt Prize for their work on explosives, but Alfred never for-gave his father for retaining the medal without offering it to him.[br]Principal Honours and DistinctionsImperial Gold Medal (Russia) 1853. Swedish Academy of Science Letterstedt Prize (jointly with son Alfred) 1868.BibliographyImmanuel Nobel produced a short handwritten account of his early life 1813–37, which is now in the possession of one of his descendants. He also had published three short books during the last decade of his life— Cheap Defence of the Country's Roads (on land mines), Cheap Defence of the Archipelagos (on sea mines), and Proposal for the Country's Defence (1871)—as well as his pamphlet (1870) on making wood a more physically flexible product.Further ReadingNo biographies of Immanuel Nobel exist, but his life is detailed in a number of books on his son Alfred.CM -
71 Northrop, James H.
SUBJECT AREA: Textiles[br]fl. 1890s Keighley, Yorkshire, England[br]English-born American inventor of the first successful loom to change the shuttles automatically when the weft ran out.[br]Although attempts had been continuing since about 1840 to develop a loom on which the shuttles were changed automatically when the weft was exhausted, it was not until J.H.Northrop invented his cop-changer and patented it in the United States in 1894 that the automatic loom really became a serious competitor to the ordinary power loom. Northrop was born at Keighley in Yorkshire but emigrated to America, where he developed his loom. In about 1891 he appears to have been undecided whether to work on the shuttle-changing system or the copchanging system, for in that year he took out three patents, one of which was for a shuttle changer and the other two for cop-changers.A communication from W.F.Draper, Northrop's employer, was used in 1894 as a patent in Britain for a cop-or bobbin-changing automatic loom, which was in fact the Northrop loom. A further five patents for stop motions were taken out in 1895, and yet another in 1896. In one shuttle-box, a feeler was pushed through a hole in the side of the shuttle each time the shuttle entered the box. When the cop of weft was full, the loom carried on working normally. If lack of weft enabled the feeler to enter beyond a certain point, a device was activated which pushed a full cop down into the place of the old one. The full cops were contained in a rotary magazine, ready for insertion.The full Northrop loom comprised several basic inventions in addition to the cop-changer, namely a self-threading shuttle, a weft-fork mechanism to stop the loom, a warp let-off mechanism and a warp-stop motion. The Northrop loom revolutionized cotton weaving in America and the Northrop system became the basis for most later automatic looms. While Northrop looms were made in America and on the European continent, they never achieved much popularity in Britain, where finer cloth was usually woven.[br]Further ReadingW.A.Hanton, 1929, Automatic Weaving, London (describes the Northrop loom and has good illustrations of the mechanism).W.English, 1969, The Textile Industry, London (explains the Northrop system). C.Singer (ed.), 1958, A History of Technology, Vol. V, Oxford: Clarendon Press.RLH -
72 Pattinson, Hugh Lee
SUBJECT AREA: Metallurgy[br]b. 25 December 1796 Alston, Cumberland, Englandd. 11 November 1858 Scot's House, Gateshead, England[br]English inventor of a silver-extraction process.[br]Born into a Quaker family, he was educated at private schools; his studies included electricity and chemistry, with a bias towards metallurgy. Around 1821 Pattinson became Clerk and Assistant to Anthony Clapham, a soap-boiler of Newcastle upon Tyne. In 1825 he secured appointment as Assay Master to the lords of the manor of Alston. There he was able to pursue the subject of special interest to him, and in January 1829 he devised a method of separating silver from lead ore; however, he was prevented from developing it because of a lack of funds.Two years later he was appointed Manager of Wentworth Beaumont's lead-works. There he was able to continue his researches, which culminated in the patent of 1833 enshrining the invention by which he is best known: a new process for extracting silver from lead by skimming crystals of pure lead with a perforated ladle from the surface of the molten silver-bearing lead, contained in a succession of cast-iron pots. The molten metal was stirred as it cooled until one pot provided a metal containing 300 oz. of silver to the ton (8,370 g to the tonne). Until that time, it was unprofitable to extract silver from lead ores containing less than 8 oz. per ton (223 g per tonne), but the Pattinson process reduced that to 2–3 oz. (56–84 g per tonne), and it therefore won wide acceptance. Pattinson resigned his post and went into partnership to establish a chemical works near Gateshead. He was able to devise two further processes of importance, one an improved method of obtaining white lead and the other a new process for manufacturing magnesia alba, or basic carbonate of magnesium. Both processes were patented in 1841.Pattinson retired in 1858 and devoted himself to the study of astronomy, aided by a 7½ in. (19 cm) equatorial telescope that he had erected at his home at Scot's House.[br]Principal Honours and DistinctionsVice-President, British Association Chemical Section 1838. Fellow of the Geological Society, Royal Astronomical Society and Royal Society 1852.BibliographyPattinson wrote eight scientific papers, mainly on mining, listed in Royal Society Catalogue of Scientific Papers, most of which appeared in the PhilosophicalMagazine.Further ReadingJ.Percy, Metallurgy (volume on lead): 121–44 (fully describes Pattinson's desilvering process).Lonsdale, 1873, Worthies of Cumberland, pp. 273–320 (contains details of his life). T.K.Derry and T.I.Williams, 1960, A Short History ofTechnology, Oxford: Oxford University Press.LRD -
73 Wolf, Carl
SUBJECT AREA: Mining and extraction technology[br]b. 23 December 1838 Zwickau, Saxony, Germanyd. 30 January 1915 Zwickau, Saxony, Germany[br]German inventor of the most popular petroleum spirit safety lamp for use in mines.[br]From an old mining family in the Saxon coalfields, Wolf was aware from his youth of the urgent demand for a miner's lamp which would provide adequate light but not provoke firedamp explosions. While working as an engineer in Zwickau, Wolf spent his spare time conducting experiments for such a lamp. The basic concept of his invention was the principle that dangerous concentrations of methane and air would not explode within a small pipe; this had been established almost seventy years earlier by the English chemist Humphrey Davy. By combining and developing certain devices designed by earlier inventors, in 1883 Wolf produced a prototype with a glass cylinder, a primer fixed inside the lamp and a magnetic lock. Until the successful application of electric light, Wolfs invention was the safest and most popular mining safety lamp. Many earlier inventions had failed to address all the problems of lighting for mines; Davy's lamp, for example, would too quickly become sooty and hot. As Wolfs lamp burned petroleum spirit, at first it was mistrusted outside Saxony, but it successfully passed the safety tests in all the leading coal-producing countries at that time. As well as casting a safe, constant light, the appearance of the cap flame could indicate the concentration of fire-damp in the air, thus providing an additional safety measure. Wolfs first patent was soon followed by many others in several countries, and underwent many developments. In 1884 Heinrich Friemann, a merchant from Eisleben, invested capital in the new company of Friemann and Wolf, which became the leading producer of miners' safety lamps. By 1914 they had manufactured over one million lamps, and the company had branches in major mining districts worldwide.[br]Further ReadingF.Schwarz, 1914, Entwickelung und gegenwär-tiger Stand der Grubenbeleuchtung beim Steinkohlen-Bergbau, Gelsenkirchen (a systematic historical outline of safety lamp designs).WK
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