James Watt (1736–1819)
It is generally accepted that the birth of James Watt was destined to bring about a revolution in the utilization of power. Watt, see Fig. 1, is regarded by many to be the progenitor of the science of thermodynamics. He was not only the inventor of the separate condenser and many other parts of the steam engine, but he was the first to study the steam engine scientifically. He also made distinguished contributions to the development of workshop practice. His scientific examination of heat losses in engines led him to recognition of the influence of latent heat on steam engine economy. Watt was at one and the same time a scientist, an inventor, and a producer. He put numbers to the concept of horsepower and is credited with inventing the centrifugal governor for automatic control of the speed of the steam engine, a rotary motion device for the steam engine, a pressure gauge, a smoke-consuming furnace, and a letter-copying device based on the link transfer process. Watt also invented an approximate straight-line mechanism for his famous double-acting steam engine, thereby creating a whole new family of linkages. This brief article will focus on Watt as the inventor of parallel motion, the basis of many machines. It is interesting to note that at the age of 72, he wrote to his son : “Though I am not over-anxious after fame, yet I am more proud of the parallel motion than of any other mechanical invention I have ever made.” Watt was rightfully proud of the parallel motion four-bar linkage. This mechanical invention is believed to be the beginning of an ordered and an advanced synthetic process .
KeywordsKinematic Analysis Spur Gear Parallel Motion Steam Engine Coupler Point
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- 1.Beare, T.H., James Watt, in Proceedings of the Institution of Mechanical Engineers, London, England, Vol. 132, Publication 17, January, 1936, pp. 39–55.Google Scholar
- 2.Ferguson, E.S., Kinematics of Mechanisms from the Time of Watt, United States National Museum, Bulletin 228, Paper 27, Smithsonian Institution, Washington, DC, 1962, pp. 185–230.Google Scholar
- 3.Marshall, T.H., James Watt, The Roadmaker Series, Leonard Parsons, London, England, 1925.Google Scholar
- 4.Jacks, W., James Watt, James Maclehose and Sons, Publishers to the University of Glasgow, Scotland, 1901.Google Scholar
- 5.Muirhead, J.P., The Life of James Watt, with selections from his correspondence, London, England, 1858.Google Scholar
- 6.Dickinson, H.W., James Watt, Craftsman and Engineer, Cambridge University Press, Cambridge, England, 1936.Google Scholar
- 7.Muirhead, J.P., The Origin and Progress of the Mechanical Inventions of James Watt, Vols. 1, 2 and 3, London, England, 1854.Google Scholar
- 8.Cowper, E.A., On the Inventions of James Watt and his models preserved at Handsworth and South Kensington, in Proceedings of the Institution of Mechanical Engineers, London, England, Vol. 34, Publication 1, November, 1883, pp. 599–631.Google Scholar
- 9.Porter, C.T., Engineering Reminiscences, New York, 1908.Google Scholar
- 10.White, J., A New Century of Inventions, Manchester, England, 1822.Google Scholar
- 11.Peaucellier, C.N., Note sur une question de geometrie de compas, Nouvelles Annales de Mathématiques, Second Series, 12, 1873, pp. 71–81. (Also, a letter in Second Series, Vol. 3, 1864, pp. 414 and 415.)Google Scholar
- 13.Ramelli, A., Le Diverse et Artiftciose Machine, Paris, France, 1588.Google Scholar
- 14.Reuleaux, F., The Kinematics of Machinery-Outlines of a Theory of Machines, Translated and Edited by A.B.W. Kennedy, MacMillan and Co., London, England, 1876. Reprinted in 1963 by Dover Publications, New York (with a new Introduction by E.S. Ferguson).Google Scholar
- 15.Rankine, W.J.M., Manual of Machinery and Millwork, London, England, 1887.Google Scholar
- 16.Lardner, D., The Steam Engine, Sixth Edition, Taylor and Walton, London, England, 1836.Google Scholar
- 17.Uicker, J.J. Jr., Pennock, G.R., and Shigley, J.E., Theory of Machines and Mechanisms, Third Edition, Oxford University Press, New York, 2003.Google Scholar
- 18.Beyer, R., The Kinematic Synthesis of Mechanisms, Chapman and Hall, London, England, 1963.Google Scholar
- 21.Hartenberg, R.S. and Denavit, J., Kinematic Synthesis of Linkages, McGraw-Hill, New York, 1964.Google Scholar
- 22.Taimina, D., How to Draw a Straight Line, http://www.math.cornell.edu/~dwh/courses/M451-F02/PL-2.htm, 2003.
- 23.Cornell University, Introducing a Digital Library of Kinematics, http://www.cornell.edu/explorecornell/scene.cfm, 2003.
- 24.Kempe, A.B., How to Draw a Straight Line; A Lecture on Linkages, Macmillan, London, England, 1877.Google Scholar