his return to England he employed McNaught to make indicators for general use, and thenceforth he was continually requested to use the instrument in disputed cases of the power of steam-engines. A Treatise on the Steam Engine, 1827 Farey wrote the two-volume work A Treatise on the Steam Engine, which has been described as the finest work on technology published in the Industrial Revolution. The first volume covered the early developments of steam pumps, atmospheric engines and low pressure steam engines through the eighteenth century. In particular, the work of Savery, Newcomen, Smeaton and Watt. It was published in 1827. Rekers & Koetsier (2007) commented on this work: {{Blockquote|Of Farey’s work, only the first of two volumes was published at the time, which dealt mostly with the history of steam engines up to the death of James Watt. Farey described all sorts of engines, but gave special attention to those designed by Smeaton. Besides this, the volume also included sections on the principles of mechanics and the design of engines, avoiding mathematical formulas as most engineers at the time would not have been able to understand them, according to Farey...<ref>Rekers, W., and T. Koetsier. "On the Teaching of Mechanical Engineering in The Netherlands in the early nineteenth century: The work of GJ Verdam (1802–1866)." in: 12th IFToMM World Congress, Besanc¸on, June 18–21, 2007.</ref>}} The second volume covered the development of high-pressure steam and the simple expansion steam engine from 1800, by Trevithick and Woolf. This volume was never published; at the time of Farey's death it had been typeset, but not sold. The book was never sold as the sheets were pulped. It was reprinted in facsimile since from the author's proof, with hand-written corrections by the author, that is now in the National Reference Library of Science and Invention. Selected publications Farey, John. A treatise on the steam engine : historical, practical, and descriptive. 1827 Articles, a selection Farey, John. Contributions to Rees's Cyclopædia, etc., 1808–1818 Farey, John. "Force of Steam," in: Transactions of the Institution of Civil Engineers, (1836), i. p. 85-94, p. 111-16. Articles about Charles Mamby (ed.). "John Farey," obituary in: Minutes of Proceedings of the Institution of Civil Engineers, Institution of Civil Engineers (Great Britain), 1852. p. 100-102 Alec Skempton. "Farey, Jr., John," in: A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830. 2002. p. 223-224 Woolrich, A. P., "John Farey and