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21 Waterhouse, Major-General James
SUBJECT AREA: Photography, film and optics[br]b. 1841d. 28 September 1922[br]English military man and photographer.[br]Waterhouse spent most of his career in the Indian Army. In 1861–2 he was commissioned to photograph the tribes of central India, and over the next few years visited many parts of the subcontinent. In November 1866, after working for five months in the Great Trigonometrical Survey learning the process of photozincography (an early photomechanical process used chiefly for map making), he took charge of photographic operations at the Surveyor-General's office in Calcutta, a post he held until retiring in 1897. During this time he developed many improvements in the photomechanical methods used for reproduction in his office. He also experimented with methods of colour-sensitizing photographic materials, experimenting with eosine dye and publishing in 1875 the fact that this made silver halide salts sensitive to yellow light. He also discovered that gelatine dry plates could be made sensitive to red and infra-red illumination by treatment with alizarine blue solution.He continued his researches upon his retirement and return to England in 1897, and made a special study of the early history of the photographic process. His work on dye sensitizing brought him the Progress Medal of the Royal Photographic Society, and the Vienna Photographic Society awarded him the Voigtländer Medal for researches in scientific photography. One invention often erroneously attributed to him is the Waterhouse stop, the use of a series of perforated plates as a means of adjusting the aperture of a photographic lens. This was described in 1858 by a John Waterhouse, being his only contribution to photography.BCBiographical history of technology > Waterhouse, Major-General James
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22 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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