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The Library of the World’s Best Literature. An Anthology in Thirty Volumes. 1917.

Balfour Stewart (1828–1887)

Stewart, Balfour. A Scotch physicist, one of the founders of spectrum analysis; born in Edinburgh, Nov. 1, 1828; died near Drogheda, Ireland, Dec. 19, 1887. He established his scientific reputation with a work on ‘Radiant Heat’ (1858), in which he formulated his discovery of the equality of the emissive and absorptive powers of bodies. Other works include: ‘Treatise on Heat’ (1866); ‘Elements of Physics’ (1870); ‘Conservation of Energy’ (1873). With Professor Tait he published ‘The Unseen Universe; or, Physical Speculations on a Future State’ (1875).