1822 - with his partner Charles-Marie Bouton, opened the Diorama in Paris, an exhibition of pictorial views, with various effects induced by changes in the lighting. 1826 - partnered with Nicéphore Niépce in the development of Niépce’s heliographic process. 1833 - following the death of Niépce, Daguerre continued his experiments, and it was he who discovered that exposing an iodized silver plate in a camera would result in a lasting image if the latent image on the plate was developed by exposure to fumes of mercury and then fixed by a solution of common salt. 1839 - a full description of his daguerreotype process was announced at a meeting of the Academy of Sciences and he was appointed an officer of the Legion of Honour. 1839 - assigned an annuity of 6,000 francs in return for his photographic process.