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http://www.ieeeghn.org/wiki/index.php/Milestones:Volta's_Electrical_Battery_Invention,_179…

…it. He built a battery, known as a Voltaic pile, made of alternating copper and zinc discs, with each pair of metals separated by flannel soaked in weak acid. Such was his fame that in 1801 he was summoned to Paris by Napoleon who had a special medal struck in Volta's honor. The …

https://ethw.org/Milestones:Discovery_of_Radioconduction_by_Edouard_Branly,_1890

…ator of the Milestone) Ed. EdP Sciences (2005) See also, in English : http://en.wikipedia.org/wiki/Edouard_Branly http://en.wikipedia.org/wiki/History_of_radio 3/ List of Edouard Branly’s communication at French Academy of Science 1/ Recherches sur le rayonnement solaire (avec P.…