James Dewar


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Dewar, James

 

Born Sept. 20, 1842, in Kincardine-on-Forth, Scotland; died Mar. 27, 1923, in London. British physicist and chemist. Member of the Royal Society of London (1877).

Dewar graduated from the University of Edinburgh in 1861. He was a professor at Cambridge University (from 1875) and at the Royal Institution in London (from 1877). He was also president of the Chemical Society of England (1897). Dewar studied carbonyl compounds and ozone. In 1871 he proposed structural formulas for benzene and pyridine. His principal works dealt with the study of thermal phenomena. In 1872 he worked out methods of measuring specific heat at low temperatures and discovered that it decreases with decreasing temperature. In 1898 he obtained liquid hydrogen for the first time and determined its constants. Dewar invented a vessel in which bodies can retain their temperatures for long periods of time. He investigated the change in the electrical conductivity of metals as a function of temperature. In collaboration with P. Curie he experimentally proved (1904) that helium is formed during the radioactive decay of radon.

WORKS

Collected Papers, vols. 1–2. Cambridge, 1927.

REFERENCE

“Sir J. Dewar (1842-1923).” Proceedings of the Royal Society of London. Series A, 1926, vol. III , no. 759.
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This summer, I ask you, through your vote, to grant me the distinct honor and privilege of representing James Dewar and the millions of everyday Americans who have dared to test the boundaries of their imaginations.
Anniversaries: 356BC: Birth of Alexander the Great; 1258: Salisbury Cathedral consecrated; 1803: Irish patriot Robert Emmet hanged for his part in trying to seize Dublin castle; 1842: Birth of chemist and physicist Sir James Dewar, inventor of the vacuum flask; 1854: The Allied armies defeated the Russians at the Battle of Alma in the Crimean War that produced six Victoria Crosses; 1869: Birth of comedian Sir George Robey; 1885: Birth of American jazz musician Jelly Roll Morton; 1967: Liner Queen Elizabeth II launched at Clydebank; 1984: Suicide bomber kills 40 after driving into US Embassy compound in Beirut with lorry-load of explosives.
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This naturally carried on to some of the famous inventors that we have had in history, like Alexander Graham Bell, who invented the telephone, and Sir James Dewar, the inventor of the Dewar flask.
Please send your pictures to Ian Jones, Peoplepost, Daily Post, PO Box 202, Vale Road, Llandudno Junction, Conwy LL31 9ZD1842: Sir James Dewar, Scottish physician and chemist, and inventor of the vacuum flask, was born in Fife.
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