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41 Taylor, Albert Hoyt
[br]b. 1 January 1874 Chicago, Illinois, USAd. 11 December 1961 Claremont, California, USA[br]American radio engineer whose work on radio-detection helped lay the foundations for radar.[br]Taylor gained his degree in engineering from Northwest University, Evanston, Illinois, then spent a time at the University of Gottingen. On his return to the USA he taught successively at Michigan State University, at Lansing, and at the universities of Wisconsin at Madison and North Dakota at Grand Forks. From 1923 until 1945 he supervised the Radio Division at the US Naval Research Laboratories. There he carried out studies of short-wave radio propagation and confirmed Heaviside's 1925 theory of the reflection characteristics of the ionosphere. In the 1920s and 1930s he investigated radio echoes, and in 1933, with L.C.Young and L.A.Hyland, he filed a patent for a system of radio-detection that contributed to the subsequent development of radar.[br]Principal Honours and DistinctionsInstitute of Electrical and Electronics Engineers Morris N.Liebmann Memorial Award 1927. President, Institute of Radio Engineers 1929. Institute of Electrical and Electronics Engineers Medal of Honour 1942.Bibliography1926, with E.O.Hulbert, "The propagation of radio waves over the earth", Physical Review 27:189.1936, "The measurement of RF power", Proceedings of the Institute of Radio Engineers 24: 1,342.Further ReadingS.S.Swords, 1986, Technical History of the Beginnings of Radar, London: Peter Peregrinus.See also: Watson-Watt, Sir Robert AlexanderKF -
42 Townes, Charles Hard
SUBJECT AREA: Electronics and information technology[br]b. 28 July 1915 Greenville, South Carolina, USA[br]American physicist who developed the maser and contributed to the development of the laser.[br]Charles H.Townes entered Furman University, Greenville, at the early age of 16 and in 1935 obtained a BA in modern languages and a BS in physics. After a year of postgraduate study at Duke University, he received a master's degree in physics in 1936. He then went on to the California Institute of Technology, where he obtained a PhD in 1939. From 1939 to 1947 he worked at the Bell Telephone Laboratories, mainly on airborne radar, although he also did some work on radio astronomy. In 1948 he joined Columbia University as Associate Professor of Physics and in 1950 was appointed a full professor. He was Director of the University's Radiation Laboratory from 1950 to 1952, and from 1952 to 1955 he was Chairman of the Physics Department.To meet the need for an oscillator generating very short wavelength electromagnetic radiation, Townes in 1951 realized that use could be made of the different natural energy levels of atoms and molecules. The practical application of this idea was achieved in his laboratory in 1953 using ammonia gas to make the device known as a maser (an acronym of microwave amplification by stimulated emission of radiation). The maser was developed in the next few years and in 1958, in a joint paper with his brother-in-law Arthur L. Schawlow, Townes suggested the possibility of a further development into optical frequencies or an optical maser, later known as a laser (an acronym of light amplification by stimulated emission of radiation). Two years later the first such device was made by Theodore H. Maiman.In 1959 Townes was given leave from Columbia University to serve as Vice-President and Director of Research at the Institute for Defense Analyses until 1961. He was then appointed Provost and Professor of Physics at the Massachusetts Institute of Technology. In 1967 he became University Professor of Physics at the University of California, where he has extended his research interests in the field of microwave and infra-red astronomy. He is a member of the National Academy of Sciences, the Institute of Electrical and Electronics Engineers and the American Astronomical Society.[br]Principal Honours and DistinctionsNobel Prize for Physics 1964. Foreign Member, Royal Society of London. President, American Physical Society 1967. Townes has received many awards from American and other scientific societies and institutions and honorary degrees from more than twenty universities.BibliographyTownes is the author of many scientific papers and, with Arthur L.Schawlow, ofMicrowave Spectroscopy (1955).1980, entry, McGraw-Hill Modern Scientists and Engineers, Part 3, New York, pp. 227– 8 (autobiography).1991, entry, The Nobel Century, London, p. 106 (autobiography).Further ReadingT.Wasson (ed.), 1987, Nobel Prize Winners, New York, pp. 1,071–3 (contains a short biography).RTS -
43 Voigt, Paul Gustavus Adolphus Helmuth
[br]b. 9 December 1901 Forest Hill, London, Englandd. 9 February 1981 Brighton, Ontario, Canada[br]English/Canadian electronics engineer, developer of electromechanical recording and reproductions systems, amplifiers and loudspeakers.[br]He received his education at Dulwich College and in 1922 graduated with a BSc from University College, London. He had an early interest in the application of valve amplifiers, and after graduating he was employed by J.E.Hough, Edison Bell Works, to develop a line of radio-receiving equipment. However, he became interested in the mechanical (and later electrical) side of recording and from 1925 developed principles and equipment. In particular he developed capacitor microphones, not only for in-house work but also commercially, until the mid-1930s. The Edison Bell company did not survive the Depression and closed in 1933. Voigt founded his own company, Voigt Patents Ltd, concentrating on loudspeakers for cinemas and developing horn loudspeakers for domestic use. During the Second World War he continued to develop loudspeaker units and gramophone pick-ups, and in 1950 he emigrated to Toronto, Canada, but his company closed. Voigt taught electronics, and from 1960 to 1969 he was employed by the Radio Regulations Laboratory in Ottawa. After retirement he worked with theoretical cosmology and fundamental interactions.[br]BibliographyMost of Voigt's patents are concerned with improvements in the magnetic circuit in dynamic loudspeakers and centring devices for diaphragms. However, UK patent nos. 278,098, 404,037 and 447,749 may be regarded as particularly relevant. In 1940 Voigt contributed a remarkable paper on the principles of equalization in mechanical recording: "Getting the best from records, part 1—the recording characteristic", Wireless World (February): 141–4.Further ReadingPersonal accounts of experiences with Voigt may be found in "Paul Voigt's contribution to Audio", British Kinematography Sound and Television (October 1970): 316–27, which also includes a list of his patents.GB-NBiographical history of technology > Voigt, Paul Gustavus Adolphus Helmuth
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44 Williamson, David Theodore Nelson
[br]b. 15 February 1923 Edinburgh, Scotlandd. 1992 Italy[br]Scottish engineer, inventor of the Williamson Amplifier and computer-controlled machine tools.[br]D.T.N.Williamson was educated at George Heriot's School, Edinburgh, and studied mechanical engineering at the University of Edinburgh and electrical engineering at Heriot-Watt College (now Heriot-Watt University), Edinburgh. He joined the MO Valve Company in London in 1943 and worked in his spare time on improving the sound reproduction for gramophones, and in 1946 invented the "Williamson Amplifier".That same year Williamson returned to Edinburgh as a development engineer with Ferranti Ltd, where he was employed in developing computer-controlled machining systems. In 1961 he was appointed Director of Research and Development at Molins Ltd, where he continued work on computer-controlled machine tools. He invented the Molins System 24, which employed a number of machine tools, all under computer control, and is generally acknowledged as a significant step in the development of manufacturing systems. In 1974 he joined Rank Xerox and became Director of Research before taking early retirement to live in Italy. Between 1954 and 1979 he served on numerous committees relating to computer-aided design, manufacturing technology and mechanical engineering in general.[br]Principal Honours and DistinctionsFRS 1968.BibliographyWilliamson was author of several papers and articles, and contributed to the ElectronicEngineers' Reference Book (1959), Progress in Automation (1960) and the Numerical Control Handbook (1968).RTSBiographical history of technology > Williamson, David Theodore Nelson
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