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Lord Kelvin (1824-1907), British physicist and mathematician. Born William Thomson, he was co-discover in 1852 of the Joule-Thomson effect. In 1848, he proposed the existence of absolute zero and the use of an absolute temperature scale, which was named the Kelvin scale. In 1866 he was knighted, and then made Baron Kelvin in 1892. He was President of the Royal Society and also appointed to the Order of Merit. This photogravure, based on an Elliot and Fry photograph, is from 'Lord Kelvin' (1899) by the Irish physicist George Francis FitzGerald (1851-1901).
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