Louis Jacques Mande Daguerre, French photography pioneer, c 1840.
© Science Museum / Science & Society Picture Library
Daguerreotype by an unknown photographer. Daguerre (1787-1851), French physicist and photography pioneer, collaborated on his original photography research with Joseph Niepce (1765-1833). The daguerreotype proces, the first widespread and practical photographic proces, was announced to the French Academy of Sciences on 9 January 1839. The proces comprises a copper plate with a highly polished silver surface sensitised by iodine fumes, exposed in a camera, and developed by fuming over warmed mercury, producing a reversed and unique image.