DAGUERRE, LOUIS. - THE HELIOGRAPHIC PROCESS.

Des procédés photogéniques considérés comme moyens de gravure. - Lettre de M. Daguerre à M. Arago. (Séance du undi 30 Septembre 1839).

(Paris, Bachelier, 1839). 4to. No wrappers. In: "Comptes Rendus Hebdomadaires des Séances de L'Academie des Sciences", Tome IX, No 14). Entire issue offered. Pp. 415-436. Daguerre's letter: pp. 423-429.

First printing of Daguerres letter to Arago in which he relates the process of heliography and describes his contract with Niépce to exploit the heliogrphis process. The Heliogravure was invented by Niépce.

Order-nr.: 46848