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Invented by Louis-Jacques-Mandé Daguerre and introduced worldwide in 1839, daguerreotype was almost completely superseded by 1860 with new, less expensive processes yielding more readily viewable images.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.
Daguerreotype
Isidore did not contribute anything to the invention of the Daguerreotype and he was not let in on the details of the invention. Nevertheless, he benefited from the state pension awarded to him together with Daguerre.