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Encyclopedia Britannica



CLAUDET, ANTOINE FRANCOIS JEAN (1797-1867)

This article appears in Volume V06, Page 463 of the Encyclopedia Britannica.

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


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