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Additional info for A History of Control Engineering 1800-1930
Also, by Fig. 21 Parson's steam turbine with 'gust'governor [Reprinted by permission of the Smithsonian Institution Press from Feedback mechanisms, 0. Mayr, Smithsonian studies in history and technology: number 12: Figure 52. Washington, DC: Smithsonian Institution Press, 1971 ] 3 o (ft I* §• o CD 5 The regulation of prime movers 45 this time, improvements in gear cutting had reduced another source of vibration. Gust governing was implemented in several ways: in some cases the duration of the gust was directly controlled by the regulator, in others the gust action was simply obtained by superimposing motion derived from an eccentric on the normally regulated setting of the throttle valve.
See MAYR: Origins, pp. 113-115, for details of early publications referring to the governor 21 Drinkwater to Boulton and Watt, 21 November, 1789, quoted in Dickinson and Jenkins, op. , p. : 'On a new steam-engine governor*, Philos. , 1823, 62, pp. : British Patent 8623,1840. * The regulation of prime movers 47 24 BENNETT: op. , p. 125. Field, in the discussion on J. Woods's paper, 'Exhibition and description of the chronometric governor invented by E. W. and C. W. Siemens', Minutes & Proceedings of the Institution of Civil Engineers, 1846, 5, pp.
99-100 for details 12 British Patent 1628, 1787, THOMAS MEAD, 'Regulator for wind and other mills* 13 ALDERSON: Mechanics Magazine, 1825,4, p. 238 14 For example, North Leverton, Nottinghamshire. The windmill has weightloaded shutter sails, a fan tail and a lift tenter 15 See the Watt-Dearman correspondence in DICKINSON, H. : James Watt and the steam engine (Oxford University Press, 1927), pp. t Reports (Longman, Hurst, Rees, Orme & Brown, London, 1812 Vol. 2), p. 396 17 Watt to Boulton, 17 April 1786, quoted from Dickinson and Jenkins, op.