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ANTOINE FRANCOIS JEAN CLAUDET (1797-1...

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Originally appearing in Volume V06, Page 463 of the 1911 Encyclopedia Britannica.
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ANTOINE
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FRANCOIS
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JEAN
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CLAUDET (1797-1867)  ,
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French photographer, was
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born at
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Lyons on the 12th of
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August 1797 . Having acquired a
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share in L . J . M .
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Daguerre's invention, he was one of the first to practise daguerreotype
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portraiture in
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England, and he improved the sensitizing
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process by using
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chlorine in addition to
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iodine, thus gaining greater rapidity of
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action . In 1848 he produced the photographometer, an
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instrument designed to measure the intensity of photogenic rays; and in 1849 he brought out the focimeter, for securing a perfect
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focus in photo-graphic portraiture . He was elected a
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fellow of the Royal Society in 1853, and in 1858 he produced the stereomonoscope, in reply to a
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challenge from
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Sir
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David
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Brewster . He died in
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London on the 27th of
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December 1867 .

End of Article: ANTOINE FRANCOIS JEAN CLAUDET (1797-1867)
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