SIR JOHN HENRY LEFROY 1817-1890

SIR JOHN HENRY LEFROY 1817-1890

A pioneer in the study of terrestrial magnetism, Lefroy was director of the magnetic observatory here from 1842 to 1853. Born in Hampshire, England, he was commissioned in the Royal Artillery at the age of seventeen and, because of his aptitude for science, was posted to St. Helena in 1839 to establish a magnetic observatory. Three years later he was transferred to Toronto. During 1843-44, Lefroy conducted the first comprehensive magnetic and meteorological survey in British North America, making observations of exceptional scope and scientific value. Before returning to England in 1853, he was made instrumental in persuading the provincial government to assume responsibility for the observatory. Following a distinguished career as a soldier, scholar and colonial administrator, Lefroy was knighted in 1877.

Ontario Heritage Trust, an agency of the Government of Ontario

Sarah J. McCabe

February 26, 2023