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JAMES THOMSON (1822-1892)

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Originally appearing in Volume V26, Page 874 of the 1911 Encyclopedia Britannica.
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JAMES See also:THOMSON (1822-1892)  , See also:British physicist See also:acid engineer, was See also:born in See also:Belfast on the 16th of See also:February 1822, and, like his younger See also:brother, See also:Lord See also:Kelvin, at an unusually See also:early See also:age began to attend the classes at See also:Glasgow University, where his See also:father had been appointed See also:professor of See also:mathematics in 1832 . After his See also:graduation he decided to study See also:civil See also:engineering, and for that purpose became a See also:pupil in several engineering offices and See also:works successively; but See also:ill-See also:health obliged him to leave them all, and he had finally to accept the fact that an occupation involving See also:physical exertion was out of the question . Accordingly, from about 1843, he devoted himself to theoretical See also:work and to See also:mechanical invention . To this See also:period belong his well-known researches in See also:thermodynamics, which enabled him to predict by the application of See also:Carnot's theorem that the temperature of the freezing point of substances which expand on solidifying must be lowered by the application of pressure, the See also:reverse being the See also:case with substances which See also:contract on solidification; ' Bysshe Vanolis: " Bysshe," as the commonly used See also:Christian name of See also:Shelley, See also:Thomson's favourite writer; and " Vanolis," an See also:anagram of See also:Novalis—(F. von See also:Hardenberg).and he was able to calculate the amount by which a given pressure lowers the freezing-point of See also:water, a substance which expands on solidification . His results were experimentally verified in the physical laboratories of Glasgow University under Lord Kelvin's direction, and were afterwards applied to give the explanation of regelation . In 1861 he extended them in a See also:paper on See also:crystallization and liquefaction as influenced by stresses tending to See also:change of See also:form in the crystals, and in other studies on the change of See also:state he continued See also:Thomas See also:Andrews's work on the continuity of the liquid and gaseous states of See also:matter, constructing a thermodynamic See also:model in three dimensions to show the relations of pressure, See also:volume and temperature for a substance like carbonic acid . With regard to his inventions, he devised a See also:clever feathering mechanism for the paddles of steamboats when only a boy of sixteen, and later turned his See also:attention to water engines . In 185o he patented his " vortex water-See also:wheel," and during the next three or four years carried on inquiries into the properties of " whirling fluids," which resulted in improved forms of blowing-fans and water-turbines (see See also:HYDRAULICS) . Settling in Belfast in 1851, he was selected to be the See also:resident engineer to the Belfast Water Commissioners in 1853, and four years later became professor of civil engineering and See also:surveying in See also:Queen's See also:College, Belfast . Thence he removed in 1873 to Glasgow as successor to Macquorn See also:Rankine in the See also:chair of engineering in the university, and retained this position until 1889, when the failure of his eyesight compelled him to resign . He died on the 8th of May 1892 at Glasgow . His contributions to See also:geological See also:science included studies of the parallel roads of Glen See also:Roy and of the prismatic jointing of See also:basalt, as seen at the See also:Giant's See also:Causeway .

In 1876 and following years he studied the origin of windings of See also:

rivers in alluvial plains and made many experiments with the aid of artificialstreams; and the currents of atmospheric circulation afforded him the material for the Bakerian lecture of 1892 .

End of Article: JAMES THOMSON (1822-1892)
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