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GEISSLER, HEINRICH (1814-1879)

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Originally appearing in Volume V11, Page 554 of the 1911 Encyclopedia Britannica.
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GEISSLER, HEINRICH (1814-1879) , See also:German physicist, was See also:born at the See also:village of Igelshieb in See also:Saxe-See also:Meiningen on the 26th of May 1814 and was educated as a See also:glass-blower. In 1854 he settled at See also:Bonn, where he speedily gained a high reputation for his skill and ingenuity of conception in the fabrication of chemical and See also:physical apparatus. With See also:Julius See also:Plucker, in 1852, he ascertained the maximum See also:density of See also:water to be at 3.8° C. He also determined the coefficient of expansion for See also:ice between -24° and -7°, and for water freezing at o°. In 1869, in See also:con-junction with H. P. J. Vogelsang, he proved the existence of liquid See also:carbon dioxide in cavities in See also:quartz and See also:topaz, and later he obtained amorphous' from See also:ordinary See also:phosphorus by means of the electric current. He is best known as the inventor of the sealed glass tubes which See also:bear his name, by means of which are exhibited the phenomena accompanying the See also:discharge of See also:electricity through highly rarefied vapours and gases. Among other apparatus contrived by him were a vaporimeter, See also:mercury See also:air-See also:pump, balances, normal thermometer, and areometer. From the university of Bonn, on the occasion of its See also:jubilee in 1868, he received the honorary degree of See also:doctor of See also:philosophy. He died at Bonn on the 24th of See also:January 1879.

See A. W. See also:

Hofmann, Der. d. deut. chem. Ges. p. 148 (1879).

End of Article: GEISSLER, HEINRICH (1814-1879)

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