McLennan, Sir John Cunningham

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First doctorate in Physics from UofT (1900); studied subsequently at Cavendish Laboratory, Cambridge University

UofT Department of Physics 1907-1931; Director of Physical Laboratory
Atomic spectroscopy; superconductivity; low-temperature physics; discovery of cosmic rays

Developed first helium liquefaction plant in North America

1928 Gold Medal of the Royal Society of London (with his assistant Gordon Shrum) for work on the spectra of hydrogen, hylium, and nitrogen at low temperatures
Election to Royal Society of London in 1915; knighted in 1935 for outstanding accomplishments in research

Honours KBE, FRS Knighted 1935,

Sir John Cunningham McLennan: A Memoir. Toronto: University of Toronto Press, 1939.

Brown, Robert Craig. ‘The life of Sir John Cunningham McLennan, PhD, OBE, KBE, 1867-1935,’ Physics in Canada/La physique au Canada, 56, 2 (March/April 2000) 91-101