File:Murray Shutter Telegraph 1795.png
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Summary
| Description |
English: A diagram of the six shutter telegraph invented by Lord George Murray in 1795, and used by the British Admiralty to communicate from London to the English coast from then until 1816. For more about this system, see http://en.wikipedia.org/wiki/Semaphore_line#U.K. and it's references. |
| Date | |
| Source | From the article "Lieutenant Watson's Telegraph", Mechanics' Magazine, No. 222, published by Knight and Lacey, London, page 296. See: https://books.google.com/books?id=rNZQAAAAYAAJ&pg=PA298 |
| Author | Touchup by myself (in USA) from screenshot (in USA) from Google books of this PD (life + 70) artwork by unknown author in Mechanics' Magazine. |
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.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 03:51, 2 May 2011 | No thumbnail | 670 × 554 (42 KB) | wikimediacommons>Heliograph | {{Information |Description ={{en|1=A diagram of the six shutter telegraph invented by Lord George Murray in 1795, and used by the British Admiralty to communicate from London to the English coast from then until 1816. For more about this system, see ht |
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