Sir James Dewar
(1842-1923), ChemistSitter in 5 portraits
A physicist whose study of low-temperature phenomena included the use of a double-walled vacuum flask of his own design that has been named after him. He was also the first person to liquefy and solidify hydrogen gas. Dewar was appointed professor at the University of Cambridge in 1875 and at the Royal Institution two years later. He held both posts throughout his life. In around 1892 he came up with the idea of using vacuum-jacketed vessels for the storage of low-temperature liquid gases. The resulting device was so efficient in maintaining the temperature of gases that it became an essential tool in low-temperature scientific work. The principle Dewar invented formed the basis for the thermos flask.
by Carmelo Cernigliari-Melilli
bronze statuette, 1906
NPG 2118
by George D. MacDougald
bronze bust, 1910
NPG 2119
by Alexander Scott, or Ethel Glazebrook
platinum print, 1902
NPG x5197
by Olive Edis
platinotype on photographer's card mount, 1910s
NPG x5198
by Olive Edis
platinotype on photographer's card mount, 1910s
NPG x5199
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