The oldest surviving daguerrotype portraying Dorothy Draper. It was made in 1840 by her brother John William Draper (1811-1882) an English- American chemical physicist. The Daguerre's process for fixing photographs was published in 1839 and a year later Draper made this portrait using an exposure of 65 seconds. 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 produce chemical change.
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