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British heliographing from the Johannesburg Fort the news of the occupation, Boer war, 1900. Johannesburg was captured by the British on 31st May 1900
The Kew heliograph being used in an eclipse-viewing expedition to Spain, 1860The Kew heliograph being used in an eclipse- viewing expedition to Spain, 1860. Depicting a temporary observation point with the Kew heliograph inside, surrounded by astronomers
Heliograph, c1900. The Heliograph, a visual telegraph for sending and receiving messages by means of mirrors and sunlight