File:Early tungsten light bulb.jpg

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English: Early GE tungsten filament incandescent light bulb from around 1908, 100 watt, 120 V, produced 80 candlepower. Tungsten filaments replaced the Edison carbon filament in light bulbs in the early 20th century, because they had a longer lifetime and used less energy. In 1904 Sandor Just and Franjo Hanaman in Hungary invented the tungsten bulb. GE began making them in 1906. As in today's bulbs, several feet of filament was needed per bulb, but these early filaments didn't have the "coiled coil" structure which allows todays filaments to be compact, so the filament consisted of several long loops connected in series, supported by the elaborate wire structure in the center.
Date
Source Downloaded August 18, 2013 from A. D. Page (May 1908) "The Tungsten Lamp", Journal of the AIEE, American Institute of Electrical Engineers, New York, Vol. 10, No. 6, p. 285 on Google Books
Author A. D. Page

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current18:17, 18 August 2013Thumbnail for version as of 18:17, 18 August 2013868 × 1,606 (154 KB)Chetvorno (talk | contribs)User created page with UploadWizard

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