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Sir John Herschel, astronomer and scientist, 1810s

Sir John Herschel, astronomer and scientist, 1810s

C045/3587

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Credit

OXFORD SCIENCE ARCHIVE / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY OXFORD SCIENCE ARCHIVE / HERITAGE IMAGES / SCIENCE PHOTO LIBRARY

Caption

Sir John Herschel, astronomer and scientist, 1810s. Portrait of John Herschel as a young man. The son of astronomer Sir William Herschel, John Herschel discovered 525 nebulae and clusters. He pioneered celestial photography, introducing 'hypo' (thiosulphate) as a photographic fixative. He discovered the cyanotype or blueprint process in 1842, and carried out research on photo-active chemicals and the wave theory of light. Artist: Gaspare Gabrielli.

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