| Revision as of 18:38, 4 October 2012 editRovibroni (talk | contribs)Extended confirmed users2,243 editsNo edit summary← Previous edit | Latest revision as of 18:19, 23 October 2012 edit undoFizped~enwiki (talk | contribs)58 edits Redirect to correct German name: Alexander Just. | ||
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| {{eastern name order|Just Sándor}} | |||
| '''Sándor Just''' (1872, ]-1937, Budapest<ref>http://theop11.chem.elte.hu/main_index_files/2012_BabayTanariSzakdolgozat.pdf</ref>) was a ] ] and inventor who, with Croatian ], in 1904 was the first to develop and patent an ] with a ] filament, made by extruding a paste of tungsten powder and a carbonaceous binder, to produce a fine thread, then removing the carbon by heating in an atmosphere of hydrogen and water vapor.<ref name=Coolidge> Coolidge, W.D.., "Metallic tungsten and some of its applications," Transaction of the American Institute of Electrical Engineers, Vol. XXXI, Part 1. June 25, 1912. Pages 1219-1228. Retrieved December 14, 2011</ref> It received a Hungarian patent in 1904 and later US Patent 1,018,502. In 1905, Just and Hanaman patented a process for producing tungsten filaments by plating carbon filaments with tungsten, then removing the carbon by heating.<ref>Hirst, H. "Recent progress in tungsten metallic filament lamps," The Electrical Journal, Volume LXI, May 22, 1908, pages 215-216. Retrieved December 14, 2011</ref> These early tungsten lamps was more efficient than a carbon filament lamp, because it could operate at a high temperature, due to the high melting point of tungsten, but because the tungsten was not ductile, it was so brittle as to be of limited practical use.<ref>Day, Lance and McNeil, Ian "Biographical dictionary of the history of technology," Routledge, 1996. Cited edition is Taylor & Francis eBook, 2005, page 290. ISBN 0-20131-0. Retrieved December 14, 2011.</ref> It was supplanted by the drawn tungsten filament lamp, developed in 1910 by ]. | |||
| == References == | |||
| {{Reflist}} | |||
| == External links == | |||
| * (pdf) | |||
| {{Persondata <!-- Metadata: see ]. --> | |||
| | NAME = Just, Sandor | |||
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| | DATE OF BIRTH = 1872 | |||
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| | DATE OF DEATH = 1937 | |||
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| }} | |||
| {{DEFAULTSORT:Just, Sandor}} | |||
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Latest revision as of 18:19, 23 October 2012
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