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  Herschel, Sir john

Englishman, Sir John Herschel was born 1792. He was a Scientist, Chemist, Draftsman, Photographer and Astronomer. He was elected a fellow to the Royal Society In 1813 after submitting his first mathematical paper, while attending the University of Cambridge.

In 1820 Herschel became a founding member of the Royal Astronomical Society.

In 1821 Sir John Herschel made a grand toured Europe, where he recorded geographical and geological formations with the aid of a drawing tool called the camera lucida. this influenced his curiosuity for future developements of photogrpahy. Herschel rendered the mountains near Geneva, Switzerland, with the same attention to detail that he concentrated on a tree in the foreground. By so doing, he achieved a uniform field of focus that is closer to photographic vision than it is to the selective focus of the unaided eye.

As an accomplished chemist , in 1819 Herschel discovered the action of hyposulfite of soda on otherwise insoluble silver salts. This discovery led to the use of ""hypo"" as a fixing agent in photography, to make images permanent.

From 1833 until 1838, he traveled to the Cape of Good Hope in South Africa on his astronomical investigations, where he met Julia Margaret Cameron, who became a lifelong friend.

In 1839, Herschel invented a photographic process using sensitized paper. It was Herschel who coined the use of the terms photography, positive, and negative to refer to photographic images, in an address to the royal society.

In 1850 Herschel was appointed master of the Mint, but he resigned six years later due to poor health. His remaining years were spent working on his catalogs of double stars and of nebulae and star clusters.

Sir John Herschel Died 1871.

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