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Stewart Tresilian (9 January 1904 – 20 May 1962) was a British mechanical engineer, who played a significant role in the early development of British aero engines during World War II.
He gained a BA degree in Engineering from the University of Cambridge.
For around a year, from 1938 to 1939, he worked as an independent consultant under the name 'Templewood Engineering', an owned subsidiary of High Duty Alloys Ltd. Wallace C. Devereux set up this offshoot company in order to market their Hiduminium range of high-performance aluminium alloys to the motor-racing industry. One of Tresilian's innovations was to encourage the use of these alloys as extrusions, as well as the previous forgings.