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Valued exposure: Innovator

Sir John Frederick William Herschel

English inventor, astronomer and chemist Sir John Frederick William Herschel (son of the astronomer William Herschel who discovered Uranus) with wild white hair and a black hat circa 1867.

His pioneering work in photography resulted in many ground-breaking developments including the formulation of a fixative for use with silver-based photographs.

Photo: Julia Margaret Cameron/Hulton Archive/Getty Images

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