File:Edison's lamp.jpg
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DescriptionEdison's lamp.jpg |
English: The first glow lamp which T. A. Edison constructed had platinum wire, similar to the one devised by Changy. Edison examined the properties of many organic and inorganic substances, with a view of finding the best substance for the filament, and fixed finally upon bamboo fibre.
By means of machinery the bamboo is divided into fibres of i millimetre in diameter, and 12 centimetres in length. These fibres are pressed into U-shaped moulds, which are put by thousands into ovens, where they are allowed to become carbonised. The carbon filament is attached to platinum wires, which are fused in a glass vessel having the form shown in Fig. 431. The vessels are exhausted by air-pumps, constructed by Edison for the purpose. During exhaustion an electric current is sent through the carbon filament, for the purpose of driving off any gases which might have been absorbed by the carbon. To prevent the platinum wires from melting at high temperature, the carbon filaments are considerably thicker at the end connected with the platinum wires, so as to offer less resistance to the current. (text continues on fig. 432) |
Date | |
Source | Fig. 431 at page 458 in Electricity in the service of man by Alfred Ritter von Urbanitzky, edited, with copious additions by Richard Wormell. Published by Cassell & Company (1886) |
Author | Unknown illustrator |
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Public domainPublic domainfalsefalse |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. | |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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current | 12:54, 16 June 2012 | 326 × 706 (76 KB) | Danmichaelo (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en |1=The first glow lamp which T. A. Edison constructed had platinum wire, similar to the one devised by Changy. Edison examined the properties of many organic and inorganic substances, with a view ... |
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Orientation | Normal |
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Horizontal resolution | 266 dpi |
Vertical resolution | 266 dpi |
Software used | Adobe Photoshop Elements 6.0 Windows |
File change date and time | 18:08, 24 March 2010 |
Color space | Uncalibrated |