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| Picture No | 12904479 |
| Date | 1840 |
| Description | Telegraphic communications -- observatory hut and signals |
| Details |
Telegraphic communications -- observatory hut and signals, as invented by Chappe in France. Each position represents a letter or word.
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| Source | Engraving in 'The Penny Magazine', 15 February 1840, page 61 |
| Credit | Mary Evans Picture Library |
| Restrictions |
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