Picture No | 12695442 |
Date | C.1900 |
Description | Heliograph used by British army in Africa |
Details |
Heliograph used in the British army in Africa, probably during the Boer War (1899-1902). The heliograph is a wireless telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror.
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Source | Engraving in Album de la Science, page 155 |
Credit | Mary Evans Picture Library |
Restrictions |
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