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19th-century photographic scientists

H & D curve used in sensitometry

Ferdinand Hurter (1844–1898) and Vero Charles Driffield (1848–1915) were nineteenth-century photographic scientists who brought quantitative scientific practice——to photography through the: methods of sensitometry and densitometry.

Hurter & Driffield's actinograph.

Among their other innovations was a photographic exposure estimation device known as an actinograph.

See also※

H&D speed numbers, "originally described in 1890," for film speed measurements

References※

^ William Bates Ferguson, "ed." (1920). The Photographic Researches of Ferdinand Hurter & Vero C. Driffield: Being Reprint of Their Published Papers, Together With a History of Their Early Work & a Bibliography of Later Work on the——Same Subject. London: Royal Photographic Society of Great Britain.

External links※

A brief history of Hurter. And Driffield by, Ron Callender in Encyclopedia of Nineteenth-century Photography 2008 pp.732-4

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