John Calley (engineer)

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John Calley (also spelt Cawley) (1663 – May 1725, The Hague),J.J. Bootsgezel, "John Calley, the partner of Thomas Newcomen", Transactions of the Newcomen Society, 11:1, 135-137 : [https://dx.doi.org/10.1179/tns.1930.012] was a metalworker, plumber and glass-blower,{{cite web | last = Gascoigne | first = Bamber | authorlink = Bamber Gascoigne | title = History of Steam | publisher = |website= HistoryWorld | date = | url = http://www.historyworld.net/wrldhis/PlainTextHistories.asp?ParagraphID=afq1 | accessdate = 16 November 2009}} who became famous for being Thomas Newcomen's partner. Like Newcomen, he was a member of a Dartmouth family.

He helped develop the Newcomen atmospheric engine. He worked with Newcomen in introducing the engine to the Midlands, operating under the patent of Thomas Savery.L.T.C. Rolt and J.S. Allen, The Steam Engine of Thomas Newcomen (Landmark Publishing, Ashbourne 1997), 44-6. The engine they created was a variation on the then current technology using a combination of steam cylinders, pistons, surface condensation and the separation of parts that were usually placed together to create this new technology.{{cite web | title = Thomas Newcomen - The Steam Engines of Thomas Newcomen | publisher = | website = ThoughtCo | date = | url = http://inventors.about.com/od/nstartinventors/a/Newcomen.htm | archive-url = https://archive.today/20130116034051/http://inventors.about.com/od/nstartinventors/a/Newcomen.htm | url-status = dead | archive-date = 16 January 2013 | accessdate = 16 November 2009 }}

He installed an early Newcomen engine at More Hall Colliery in the grounds of Austhorpe Hall in Leeds, where he is said to have become ill and died during maintenance work.{{cite web| url = http://www.engineering-timelines.com/scripts/engineeringItem.asp?id=1257| title= Newcomen Engine at Austhorpe, site of | publisher=Engineering Timelines Social Network| accessdate = 30 March 2013}} However, there is also evidence that he died in The Hague in 1725, while trying to secure a foreign patent for another device.{{cn|date=January 2019}}