SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
The English-American chemical physicist John William Draper (1811-1882), a photography pioneer. The Daguerre's process for fixing photographs was published in 1839 and a year later Draper took a photograph of his sister Dorothy, which is the oldest surviving daguerrotype. Draper also pioneered the use of scientific photography. In 1840 his photograph of the Moon began astronomical photography and in 1850 he took the first microphotographs to illustrate his book on physiology. In 1841 he proposed the principle, known as Draper's law, which states that only absorbed radiation may produced chemical change. V800/002 for the oldest daguerrotype).
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