File:Track circuit Robinson 1874.jpg
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Summary
| Description |
English: Illustration of railroad track circuit invented by Dr. William Robinson in 1872, from his circular of January 1874. Legend: C-Primary signal. E-Magnet. H-Line wire circuit. I-Track battery. K-Primary signal battery. L-Distant signal. R-Relay. |
| Date | |
| Source | "The Invention of the Track Circuit." Figure 3, p. 15. |
| Author | American Railway Association, New York, USA |
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 | 04:20, 6 September 2011 | | 1,296 × 746 (686 KB) | Caseyjonz | {{Information |Description={{en|1=Illustration of railroad track circuit invented by Dr. William Robinson in 1872, from his circular of January 1874. Legend:<br /> C-Primary signal. E-Magnet. H-Line wire circuit. I-Track battery. K-Pri |
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