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AVOGADRO, Amedeo, Count of Quaregna e di Cerreto (1776-1856, chemist). Autograph manuscript, 'Esame della sostanza da cui son formate le apparenze elettro-chimiche del Sig.r Nobili', 1832, 2¼ pages, on a bifolium (marginal browning, wear to outer edge).

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AVOGADRO, Amedeo, Count of Quaregna e di Cerreto (1776-1856, chemist). Autograph manuscript, 'Esame della sostanza da cui son formate le apparenze elettro-chimiche del Sig.r Nobili', 1832, 2¼ pages, on a bifolium (marginal browning, wear to outer edge).

Avogardro's detailed examiniation of the findings of Leopoldo Nobili (1784-1835), the Italian physicist whose inventions, such as the astatic galvanometer, were critical to research in thermodynamics and electrochemistry. Nobili was Professor of Physics at the Royal Museum of Physics and Natural History in Florence, where he worked on electromagnetic induction; in 1827 he was able to measure the electric current in a frog. Avogadro was revered for his contribution to theories of molarity (the number of molecules in one mole was renamed Avogadro's number) and molecular weight; 'Avogadro's Principle' is named after his hypothesis of 1811 that 'Equal volumes of gases, at the same temperature and pressure, contain the same number of particles, or molecules'.
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