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By Stuart Bennett

Dr. Bennett strains the starting to be understanding of the significance and the importance of the idea that of suggestions in engineering and treats intimately the technical advancements that contributed to this understanding. There follows an account of the improvement of steam and hydraulic servomechanisms and their software to the keep an eye on of ships and plane.

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See MAYR: Origins, 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.

E. the acceleration of the engine; they tend to maintain, indiscriminately, the momentary speed, but cannot be set to maintain the speed at a particular value, nor can they respond to slow changes in speed. 100 However, if the inertial action can be combined with some form of action which varies proportionately with speed, 'proportional-plus-derivative control' can be obtained. Many shaft governors, by a suitable arrangement of the pivot point (as 38 The regulation of prime movers a Fig. 166 shown in Fig.

F . Allen to produce an automatic cut-off regulating gear, referred to later. Porter was, in fact, only partially correct in his analysis of the reasons for the improvement in performance which his governor gave. Problems with the Watt governor generally occurred as a result of Coulomb friction in the governor and valve linkage. With the governor shown in Fig. 1%, the centrifugal force generated by a given change in speed can be increased by increasing the mass m of the governor balls, but this has the effects of increasing the inertia of the governor and hence the driving torque, which in turn gives rise to an increase in the friction (see Appendix 1).

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