Picture No | 12904480 |
Date | 1840 |
Description | Telegraphic communications -- frame and signal boards |
Details |
Telegraphic communications -- frame and signal boards, as used by the Royal Navy along the English coast. The six octagonal boards could be opened or closed in different combinations to indicate different letters or words.
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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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