Édouard BRANLY, Physicist, in 1890 he invented the cohereur - Lot 518

Lot 518
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Édouard BRANLY, Physicist, in 1890 he invented the cohereur - Lot 518
Édouard BRANLY, Physicist, in 1890 he invented the cohereur à limailles, the first Hertzian wave detector, which was used by MARCONI in his wireless telegraph experiments etc. (Amiens 1844 - Paris 1940) - Autograph letter signed on his letterhead "Lauréat de l'Institut, 19 Sept 1905. 1p 1/2 in-8° (on the same side). "Sir, I am very annoyed to be forced to refuse a second time, but, I have works begun that I would like to finish before the Catholic Institute closes its doors. Hence the absolute impossibility of my being absent. I had to stay in Paris for the vacations..."
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