Sciences In Paris On September: RAOULT, ra-ool', Frangois Marie,French physicist and chemist: b. Fournes-en-Weppes, near Lille, France, May 10, 1830; d. Grenoble, April 1, 1901. He was educated at Reims, Sens, and Paris, where he received his doctorate in physical sciences in 1863. In 1867 he began teaching at the University of Grenoble, where he became professor of chemistry (1870) and dean of the Faculty of Sciences (1889).
Donne made the plates printable by etching out the clear silver areas so that they could hold ink, and then printing them like an etching or engraving. He showed examples to the Academy of Sciences in Paris on September 3, 1839, but refused to divulge his process. Quite independently Josef Berres of Vienna worked out a similar process. In his privately published booklet, Phototyp, containing five plates and a short text and dated August 3,1840, he called specific attention to a view of the cathedral of St. Stephan's in Vienna as his most successful plate from which he pulled "many hundred" impressions.
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