BECQUEREL, EDMOND.

Des Lois du Dégagement de la Chaleur pendant le Passage des Courants électriques a Travers les Corps solides et liquides. (+) Des Effets produits sur les Corps par les Rayons solaires. (2 Papers).

Paris, Victor Masson et Cie, 1843. 8vo. Contemp. hcalf, raised bands, gilt spine. Light wear along edges. Small stamps on verso of titlepage. In "Annales de Chimie et de Physique", 3e Series - Tome IX. 512 pp. and 4 folded engraved plates. (The entire volume offered). Becquerel's papers: pp. 21-70 a. pp. 257-322. Some scattered browspots and foxing.

First appearance of two importent papers on heat, electricity and light. In the first paper he showed that Joule’s law governing the production of heat in the passage of an electrical current applied to liquids as well as to solids and in the second paper he revealed in the presence of Fraunhofer lines in photographs of the ultraviolet portion of the spectrum by spectroscopy. Earlier he had shown that rays at the red end of the spectrum reinforced or continued the chemical action initiated by rays at the violet end. He also demonstrated that phosphorescence was stimulated in different substances by specific frequencies of light and that at some frequencies the phosphorescent glow seemed to stop immediately after the cutting off of incident light rays.

Order-nr.: 44893