Daguerreotype
Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images. In the late 20th century, there was a revival of daguerreotypy by a small number of photographers interested in making artistic use of early photographic processes.
Claude Testot-Ferry
In 1826, under Charles X, he retired at the rank of Maréchal de Camp (equivalent of Général de Brigade). Aged around 70, he was one of only two officers of the army of the First Empire ever to be photographed, in a daguerréotype, since the end of his life coincided with Daguerre's invention of this format in 1835.