File:Ronalds' electric telegraph.jpg
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Summary
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| Description |
English: Elements of the subterranean electric telegraph built by Francis Ronalds in 1816 |
| Date | |
| Source | Descriptions of an Electrical Telegraph and of some other Electrical Apparatus (1823) |
| Author | Ronalds, F. |
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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 | 10:47, 5 August 2017 | | 4,260 × 2,695 (8.64 MB) | Soerfm (talk | contribs) | Brightness |
| 04:13, 6 October 2016 |  | 4,260 × 2,695 (5.34 MB) | Sperth (talk | contribs) | User created page with UploadWizard |
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