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French physicist (1852–1908) whose experiments with uranium salts led to the discovery of spontaneous radioactivity; for this breakthrough he shared the 1903 Nobel Prize for Physics with Marie and Pierre Curie. Unsigned handwritten note in French by Henri Becquerel, one page both sides, 3 x 1.75, August 10, 1905. Becquerel pens a note on one of his personal calling cards, imprinted with his name, position, and address: "Henri Becquerel, Membre de l'Institut, 6, rue Dumont d'Urville." Becquerel writes that he "regrets not having time at the moment to go see the Mons. Belin telegraphoscope and hopes to be able to do so when he is a little freer." In fine condition.
Édouard Belin invented a phototelegraphic apparatus called the Bélinographe (télestéréographe)—a system for receiving photographs over telephone wires via telegraphic networks.
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