File:Track circuit Robinson 1874.jpg
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Summary
[edit]DescriptionTrack circuit Robinson 1874.jpg |
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
[edit]Public domainPublic domainfalsefalse |
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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:20, 6 September 2011 | 1,296 × 746 (686 KB) | Caseyjonz (talk | contribs) | {{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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Orientation | Normal |
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Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
File change date and time | 15:17, 29 August 2011 |
Color space | sRGB |
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