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Early experiments on electricity. Artwork showing details of Luigi Galvani's 1791 experiment on the legs of a frog. The upper diagram shows a silver rod (left) and a brass rod (right) being placed in contact with a foot and the spine of the frog. The experiment involved bringing the two rods together and resulted in the leg twitching as the muscles contracted. The lower diagram shows the metal rod connecting foils of two different metals, with the same result. Galvani believed that electricity was generated by the frog's nerve and muscle tissue. This error was corrected by Volta in 1800, showing the electricity was from the metals. Published in Galvani's De viribus electricitatis (1792).
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