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81 application form
HRa form used in the recruitment process to enable a job candidate to supply information about his or her qualifications, skills, and experience. Employers may ask a candidate to complete an application form instead of, or as well as, providing a résumé. Application forms should be reviewed regularly to ensure that questions asked take account of current legislation, accepted good practice, and internal organizational developments. These questions should be job-related and avoid unjustifiable intrusion into a candidate’s personal life. -
82 OPEC
abbr. FinOrganization of the Petroleum Exporting Countries: an international organization of 11 developing countries, each one largely reliant on oil revenues as their main source of income, that tries to ensure there is a balance between supply and demand by adjusting the members’ oil output. The current members, Algeria, Indonesia, Iran, Iraq, Kuwait, Libya, Nigeria, Qatar, Saudi Arabia, the United Arab Emirates, and Venezuela, meet at least twice a year to decide on output levels and discuss recent and anticipated oil market developments. -
83 Bloch, Jacob
SUBJECT AREA: Textiles[br]fl. 1888[br]European inventor of a machine for cutting layers of cloth.[br]In mass production of garments, layers of cloth are laid out on top of each other and multiples of each different part are cut out at the same time. The first portable cutting machine was invented by Joseph Bloch in 1888. It was operated from a DC electricity supply and had a circular knife, which was difficult to use when cutting round curves. Therefore the cloth had to be raised on curves so that it would reach the furthest part of the circular blade. In the same year in the USA, G.P.Eastman produced a vertically reciprocating cutting machine with a straight blade.[br]Further ReadingC.Singer (ed.), 1978, A History of Technology, Vol. VI, Oxford: Clarendon Press (describes Bloch's invention).I.McNeil (ed.), 1990, An Encyclopaedia of the History of Technology, London: Routledge, pp. 850–2 (provides a brief description of the making-up trade).D.Sinclair, "The current climate for research and development in the European-clothing industry with particular reference to single ply cutting", unpublished MSc thesis, Salford University (discusses developments in garment production).RLH -
84 Leclanché, Georges
SUBJECT AREA: Electricity[br]b. 1839 Paris, Franced. 14 September 1882 Paris, France[br]French chemist and inventor of the primary cell named after him, from which the electrochemical principles of the modern dry cell have been developed.[br]Leclanché was sent to England for his early education. Returning to France, he entered the Central School of Arts and Manufacture, from which he graduated as a chemical engineer in 1860. He spent some years with a railway company in setting up an electrical timing system, and this work led him to electrochemical research. Driven by political pressure into exile, he set up a small laboratory in Brussels to continue the studies of the behaviour of voltaic cells he had started in France. Many workers directed their efforts to constructing a cell with a single electrolyte and a solid insoluble depo-larizer, but it was Leclanché who produced, in 1866, the prototype of a battery that was rugged, cheap and contained no highly corro-sive liquid. With electrodes of carbon and zinc and a solution of ammonium chloride, polarization was prevented by surrounding the positive electrode with manganese dioxide. The Leclanché cell was adopted by the Belgian Government Telegraph Service in 1868 and rapidly came into general use wherever an intermittent current was needed; for example, in telegraph and later in telephone circuits. Carl Gassner in 1888 pioneered successful dry cells based on the Leclanché system, with the zinc anode serving as the container, and c. 1890 commercial production of such cells began.[br]Bibliography10 October 1866, British patent no. 2,623 (Leclanché cell).1868, "Pile au peroxyde de manganèse à seul liquide", Les Mondes 16:532–3 (describes the Leclanché cell).Further ReadingM.Barak, 1966, "Georges Leclanché (1939–1882)", IEE Electronics and Power 12:184– 91 (a detailed account).N.C.Cahoon and G.W.Heise (eds), 1976, The Primary Battery, Vol. II, New York, pp. 1–147 (describes subsequent developments), GW -
85 Sperry, Elmer Ambrose
[br]b. 21 October 1860 Cincinnatus, Cortland County, New York, USAd. 16 June 1930 Brooklyn, New York, USA[br]American entrepreneur who invented the gyrocompass.[br]Sperry was born into a farming community in Cortland County. He received a rudimentary education at the local school, but an interest in mechanical devices was aroused by the agricultural machinery he saw around him. His attendance at the Normal School in Cortland provided a useful theoretical background to his practical knowledge. He emerged in 1880 with an urge to pursue invention in electrical engineering, then a new and growing branch of technology. Within two years he was able to patent and demonstrate his arc lighting system, complete with its own generator, incorporating new methods of regulating its output. The Sperry Electric Light, Motor and Car Brake Company was set up to make and market the system, but it was difficult to keep pace with electric-lighting developments such as the incandescent lamp and alternating current, and the company ceased in 1887 and was replaced by the Sperry Electric Company, which itself was taken over by the General Electric Company.In the 1890s Sperry made useful inventions in electric mining machinery and then in electric street-or tramcars, with his patent electric brake and control system. The patents for the brake were important enough to be bought by General Electric. From 1894 to 1900 he was manufacturing electric motor cars of his own design, and in 1900 he set up a laboratory in Washington, where he pursued various electrochemical processes.In 1896 he began to work on the practical application of the principle of the gyroscope, where Sperry achieved his most notable inventions, the first of which was the gyrostabilizer for ships. The relatively narrow-hulled steamship rolled badly in heavy seas and in 1904 Ernst Otto Schuck, a German naval engineer, and Louis Brennan in England began experiments to correct this; their work stimulated Sperry to develop his own device. In 1908 he patented the active gyrostabilizer, which acted to correct a ship's roll as soon as it started. Three years later the US Navy agreed to try it on a destroyer, the USS Worden. The successful trials of the following year led to widespread adoption. Meanwhile, in 1910, Sperry set up the Sperry Gyroscope Company to extend the application to commercial shipping.At the same time, Sperry was working to apply the gyroscope principle to the ship's compass. The magnetic compass had worked well in wooden ships, but iron hulls and electrical machinery confused it. The great powers' race to build up their navies instigated an urgent search for a solution. In Germany, Anschütz-Kämpfe (1872–1931) in 1903 tested a form of gyrocompass and was encouraged by the authorities to demonstrate the device on the German flagship, the Deutschland. Its success led Sperry to develop his own version: fortunately for him, the US Navy preferred a home-grown product to a German one and gave Sperry all the backing he needed. A successful trial on a destroyer led to widespread acceptance in the US Navy, and Sperry was soon receiving orders from the British Admiralty and the Russian Navy.In the rapidly developing field of aeronautics, automatic stabilization was becoming an urgent need. In 1912 Sperry began work on a gyrostabilizer for aircraft. Two years later he was able to stage a spectacular demonstration of such a device at an air show near Paris.Sperry continued research, development and promotion in military and aviation technology almost to the last. In 1926 he sold the Sperry Gyroscope Company to enable him to devote more time to invention.[br]Principal Honours and DistinctionsJohn Fritz Medal 1927. President, American Society of Mechanical Engineers 1928.BibliographySperry filed over 400 patents, of which two can be singled out: 1908. US patent no. 434,048 (ship gyroscope); 1909. US patent no. 519,533 (ship gyrocompass set).Further ReadingT.P.Hughes, 1971, Elmer Sperry, Inventor and Engineer, Baltimore: Johns Hopkins University Press (a full and well-documented biography, with lists of his patents and published writings).LRD
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