1. John Joly was an Irish geologist and physicist known for his development of radiotherapy in the treatment of cancer.
11 Facts About John Joly
1. 2.
John Joly was a second cousin of astronomer Charles Jasper Joly.
3.
John Joly entered Trinity College, Dublin in 1876, graduating in Engineering in 1882 in first place with several special certificates in branches of engineering, at the same time obtaining a First Class Honours in modern literature.
4.
John Joly worked as a demonstrator in Trinity's Engineering and Physics departments before succeeding William Johnson Sollas in the Chair of Geology and Mineralogy in 1897, a position which he held until his death in 1933 in Dublin.
5.
John Joly joined the Royal Dublin Society in 1881 while still a student, and was a frequent contributor of papers.
6.
In 1886, John Joly proposed a theory on the slipperiness of ice.
7.
On 17 May 1899 John Joly read his paper, "An Estimate of the Geological Age of the Earth", to the Royal Dublin Society.
8.
John Joly calculated the rate at which the oceans should have accumulated sodium from erosion processes, and determined that the oceans were about 80 to 100 million years old.
9.
John Joly served as President of Section C when the British Association for the Advancement of Science which met in Dublin in 1908, during which he presented his paper "Uranium and Geology" an address to the society.
10.
John Joly invented a photometer for measuring light intensity, a meldometer for measuring the melting points of minerals, a differential steam calorimeter for measuring specific heats and a constant-volume gas thermometer, all of which bear his name, together with one of the first color photographic processes, the John Joly colour screen.
11.
John Joly is remembered by the Joly Geological Society, a student geological association established in 1960.