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Coral Reef and island. Time taken for building of coral reefs and islands was a proof used by Darwin to support the theory of a long geological timescale. Hand coloured engraving published 1849
Coral reef creating a lagoon. From Charles Darwin The Structure and Distribution of Coral Reefs, London, 1842. The realisation of the long time scale entailed in the creation of islands
Coral island and circling coral reef creating a lagoon. From Charles Darwin The Structure and Distribution of Coral Reefs, London, 1842
Heliograph, c1900. The Heliograph, a visual telegraph for sending and receiving messages by means of mirrors and sunlight
View in the Jungle, Bengal, 1850s. Creator: Captain R. B. HillView in the Jungle, Bengal, 1850s