John Cunningham McLennan

Sir
John Cunningham McLennan
KBE FRS FRSC
London 1934
Dean of the University of Toronto School of Graduate Studies
In office
1930–1932
Preceded byJ. Playfair McMurrich
Succeeded byGeorge Sidney Brett
Personal details
Born(1867-10-14)October 14, 1867
Ingersoll, Ontario, Canada
DiedOctober 9, 1935(1935-10-09) (aged 67)
Paris, France
Alma materUniversity of Toronto
Scientific career
FieldsPhysics
Doctoral students
John F. Allen

Sir John Cunningham McLennan, KBE FRS FRSC[1] (October 14, 1867 – October 9, 1935) was a Canadian physicist.

Born in Ingersoll, Ontario, the son of David McLennan and Barbara Cunningham, he became the director of the physics laboratory at the University of Toronto from 1906. In 1930, he was appointed dean of the U of T's School of Graduate Studies, where he persistently advocated for all research to be under the mandate of the School. However the proposal was refused by the university's senate, and McLennan resigned from the deanship and the university in 1932.[2][3]

McLennan was elected a Fellow of the Royal Society in 1915.[4] McLennan delivered the Guthrie lecture to the Physical Society in 1918. With his graduate student, Gordon Merritt Shrum, he built a helium liquefier at the University of Toronto. In 1923, they became the second group of physicists in the world to successfully produce liquid helium, 15 years after Heike Kammerlingh Onnes.[5] In 1926, McLennan was awarded the Royal Society of Canada's Flavelle Medal and in 1927 a Royal Medal.

He died in 1935 near Abbeville in France on a train from Paris to London[4] of a heart attack. He is buried beside his wife in Stow of Wedale, Scotland.[6]

References

  1. ↑ Eve, A. S. (1935). "Sir John Cunningham McLennan. 1867-1935". Obituary Notices of Fellows of the Royal Society. 1 (4): 577–583. doi:10.1098/rsbm.1935.0022. JSTOR 768989.
  2. ↑ Brown, Robert Craig. "The Life of Sir John Cunningham McLennan Ph.D., F.R.S., O.B.E., Κ.Β.Ε. 1867 -1935" (PDF). Department of Physics, University of Toronto. Retrieved 4 April 2026.
  3. ↑ Friedland, Martin (2002). The University of Toronto: A History. University of Toronto Press. ISBN 0-8020-4429-8.
  4. 1 2 "Directory of Fellows of the Royal Society". Archived from the original on 8 October 2021. Retrieved 24 August 2019.
  5. ↑ Radebaugh, R. (2007). "Historical Summary of Cryogenic Activity Prior to 1950". In Timmerhaus, K. D.; Reed, R.P. (eds.). Cryogenic Engineering - Fifty Years of Progress. New York: Springer. ISBN 978-0-387-46896-9.
  6. ↑ "Biography McLENNAN, Sir JOHN CUNNINGHAM". Retrieved 24 August 2019.
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