. Practical physics. Count Alessandro Volta (1745-1827) Great Italian physicist, professor at Como and at Pavia; inventorof the electroscope, the electrophorus, the condenser, and thevoltaic pile (a form of galvanic cell); first measured the potentialdifferences arising from the contact of dissimilar substances;ennobled by Napoleon for his scientific services; the volt, thepractical unit of potential difference, is named in his honor.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectphysics, bookyear1922