Edmond BECQUEREL (1820-1891), physicist, discoverer of the photovoltaic effect (1839), first color photograph (1848). 34 autograph manuscripts and notes; 56pages in-4 and in-fol. Interesting set, listing and analyzing the work of the various physicists of his time who contributed most to the advancement of the physical sciences: Delarive, Dove, Favre, Grove, Jacoby, Henry, Joule, Kirchoff, Koenitz, Kupffer, Magnus, Marié-Davy, Plucker, Rien, Stokes, Tyndall, Volpicelli, Weber. Note, for example, these considerations on Joule's work: "The mechanical theory of heat is a part of physics that is still very new, but which has received important developments that have brought it, in a few years, to the point where it has arrived today. Without wishing to discuss the rights or wrongs of the scientists who have enunciated the fundamental principle on which it rests, and the part played by Sadi Carnot, Mr. Séguin and Mayer in the origin of this research, one cannot help recognizing that M. Joule is the physicist who, through his experimental research, has perhaps contributed most to the creation of the mechanical theory of heat"... A manuscript in another hand (8p. in-4 on the letterhead of the Imperial Academy of Sciences, St. Petersburg) lists all the works published by Moritz von Jacobi. Enclosed is a folder of autograph notes (approx. 20p. various formats), for his courses in applied physics at the Muséum, meteorological observations, notes on work submitted for a Volta battery prize competition, etc.; notes by another hand on electric light; 6 printed brochures from the Académie des Sciences (Becquerel's speeches and memoirs; Fuzeau's funeral speech); and miscellaneous documents.