File:Toroidal telephone loading coil.jpg
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Summary
| Description |
English: A loading coil for a 1922 AT&T long distance telephone trunkline between New York and Chicago. It consists of a toroidal iron core with two 0.175 H windings. Each twisted pair in the telephone trunkline is attached to a loading coil. The coils are contained in steel tanks on the telephone pole, immersed in oil. The line required a loading coil every 6000 ft. |
| Date | |
| Source | Retrieved February 21, 2014 from James J. Pilliod, "Philadelphia-Pittsburgh section of the New York-Chicago cable" in Transactions of the AIEE, American Institute of Electrical Engineers, New York, August 1922, p. 452, fig. 18 on Google Books |
| Author | James J. Pilliod |
Licensing
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:39, 3 May 2021 | | 827 × 816 (138 KB) | Materialscientist | FFT |
| 07:30, 22 February 2014 |  | 827 × 816 (75 KB) | Chetvorno | User created page with UploadWizard |
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