File:Hugh Longbourne Callendar 2.jpg

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current	17:08, 2 March 2020		1,311 × 1,854 (660 KB)	commons>Materialscientist	{{Information \|description=Hugh Longbourne Callendar, English physicist, c 1900. \|date=c.1900 \|source=[https://www.gettyimages.com/detail/nieuwsfoto's/callendar-was-professor-of-physics-at-mcgill-university-nieuwsfotos/90771984] \|author=Unknown \|permission={{PD-UK-unknown}} \|other versions= }} Category:Physicists from the United Kingdom

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Image title	ENGLAND - SEPTEMBER 09: Callendar (1863-1930) was professor of physics at McGill University, Montreal; at University College London; and at the Imperial College of Science. Callendar invented an air thermometer with constant pressure which could measure up to 450 degrees Celsius. He also made a platinum resistance thermometer which was extremely accurate. (Photo by SSPL/Getty Images)