Murray_Shutter_Telegraph_1795.png (670 × 554 pixels, file size: 42 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:51, 2 May 2011 | 670 × 554 (42 KB) | 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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