L30_Elec2 - Interlude A bit of history Luigi...

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Interlude: A bit of history Luigi Galvani (1737-1798): Italian physician, studied “animal electricity”
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From Galvani's own description of the experiments: " Therefore having noticed that frog preparations which hung by copper hooks from the iron railings surrounding a balcony of our house contracted not only during thunder storms but also in fine weather, I decided to determine whether or not these contractions were due to the action of atmospheric electricity .... Finally .... I began to scrape and press the hook fastened to the back bone against the iron railing to see whether by such a procedure contractions might be excited, and whether instead of an alteration in the condition of the atmospheric electricity some other changes might be effective. I then noticed frequent contractions, none of which depended on the variations of the weather ." 1870: constructed first electric cell with 2 different metals and natural fluids from dissected frog
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Alessandro Volta (1745-1827): professor at the University of Pisa (Italy) 1780: improved electrical cell (2 metals Ag and Zn, leather, salt water) Volta demonstrated the actions of piles such as the one shown to Napoleon who was reportedly quite impressed. A year after Volta was created count by Napoleon.
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Sir Michael Faraday
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1813: Sir Humphrey Davy (England) constructed a giant battery (2,000 plates, 889 sq. ft. in the basement of Britain Royal Society). He studied chemical transformations induced by electrical current, e.g., he produced elemental Na and K from their hydroxides.
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