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).
The Success of this experiment gave rise to the modern photomechanical printing industry.
In 1852 a Parisian lithographer Lemercier, with two chemists, Barreswil and Davanne, and an optician, Lerebours, developed a version of the bitumen of Judea process devised by Nicephore Niepce to make his Heliographs. Their process was the first successful method of obtaining half-tone photographic reproductions from a lithographic stone. On the 20th June of that year they submitted a description of their invention to the Academy of Sciences at Paris. Two years later, Lemercier went further and published a set of six halftone prints under the title Lithophotographie: Ou Impressions Obtenues Sur Pierre À L’aide De La Photographie. A full set of these prints was given to the Paris Academy of Sciences (9 January, 1854) as further proof that practical photo-lithography had been achieved. However, the success of their method was limited. Lemercier soon abandoned it because only a few copies could be reliably made and after 1860 he adopted Alphonse Poitevin’s process in preference to the method he and his associates had patented.
NYPL, Specimens of the Earliest Photographic Experiments of Fox Talbot and the French School of Daguerre from the possession of Hippolyte Louis Fizeau