File:Tungar bulbs.jpg
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Size of this preview: 457 × 600 pixels. Other resolutions: 183 × 240 pixels | 366 × 480 pixels | 813 × 1,067 pixels.
Original file (813 × 1,067 pixels, file size: 111 KB, MIME type: image/jpeg)
Summary
| Description |
English: Two General Electric Tungar rectifier bulbs from 1917. The lefthand one is rated at 2 amperes and the right at 6 amperes. These consist of a glass bulb filled with low pressure argon gas, containing a tungsten filament and a carbon pellet anode. Ionization of the gas reduced the forward ("on") voltage to much lower values than could be achieved in the thermionic diode rectifier tube, allowing it to rectify low voltages. It was used as a low voltage rectifier in devices such as battery chargers until it was replaced by selenium diodes before World War 2. Alterations to image: removed aliasing artifacts (crosshatched lines) due to scanning of halftone photo using Gimp FFT filter. |
| Date | |
| Source | Downloaded August 19, 2013 from R. E. Russell (March 1917) "The Tungar Rectifier", The General Electric Review, General Electric Corp., New York, Vol. 20, No. 3, p. 209, Fig. 1 on Google Books |
| Author | R. E. Russell |
Licensing
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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 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 11:28, 3 May 2021 | | 813 × 1,067 (111 KB) | wikimediacommons>Materialscientist | FFT |
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