Autograph Letter Signed, to Pierre Hippolyte Boutigny, professor of chemistry, in Paris. In Italian. A good one page example 10½ x 8½ inches, right margin ragged, integral address leaf (postal markings), tipped on to an old album page. Padua, 22 August 1852. Francesco Zantedeschi (1797-1873, Italian priest and physicist, published papers (1829 and 1830) on the production of electric currents in closed circuits by the approach and withdrawal of a magnet, thereby anticipating Michael Faraday’s classical experiments of 1831. While carrying out researches on the solar spectrum, Zantedeschi was among the first to recognize the marked absorption by the atmosphere of red, yellow, and green light.