John Joly

John Joly

Infobox Scientist
name = John Joly
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caption = John Joly
birth_date = November 1 1857
birth_place = Bracknagh, County Offaly
death_date = December 8 1933
death_place = Dublin, Ireland
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nationality = Ireland
ethnicity =
field = geology medicine
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known_for = radiotherapy cohesion-tension theory
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John Joly (November 1 1857 – December 8 1933) was an Irish scientist, possibly most famous for his development of radiotherapy in the treatment of cancer. He is also known for developing techniques to accurately estimate the age of a geological period, based on radioactive elements present in minerals.

Joly was born in Holywood House, Bracknagh, County Offaly, Ireland.He entered Trinity College, Dublin, to become a graduate in engineering in 1882 and later become Professor of Geology there. In his career he wrote over 270 books and scientific papers. In 1884Fact|date=July 2008 he patented the Joly color screen process of colour photography, a line-based screen-plate process.

Joly's paper "Uranium and Geology" was given as an address to the British Association for the Advancement of Science which met in Dublin in 1908. This work described radioactive materials in rocks and their part in the generation of the Earth's internal heat.

Joly, along with Henry Horatio Dixon, put forward the cohesion-tension theory. This is now thought to be the main mechanism for the upward movement of water in plants.

He died in Dublin, Ireland.

His second cousin Charles Jasper Joly became Astronomer Royal for Ireland in 1897.

A crater on Mars was named in his honor.

External links

* [http://www.europhysicsnews.com/full/08/article2/article2.html The parrot, the pince-nez and the pleochroic halo ] at www.europhysicsnews.com
* [http://www.irishmidlandsancestry.com/content/offaly/people/literature_irish.htm Contribution of Offaly Writers to Irish Literature - Ancestral Research, Family History, Laois, Offaly, Genealogy ] at www.irishmidlandsancestry.com
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