Lithophotography test Le Secq, Henri  (French, 1818-1882)

Stamped with, "Breveté S. G. D. G". Breveté SGDG was a French type of patent that ceased to exist in 1968. The name was a common abbreviation for "Breveté Sans Garantie Du Gouvernement“ (patent without government guarantees).

Reproduced / Exhibited

NYPL, Specimens of the Earliest Photographic Experiments of Fox Talbot and the French School of Daguerre from the possession of Hippolyte Louis Fizeau