[1] The color layers were applied using lithographic techniques, and then the embossing was used to give relief to buildings, walls, mountains and other architectural and geographic features.
The same method was sometimes used for the production of relief prints of buildings, plants, sculptures, landscape views or other graphic motives.
[2] The technique was developed by the German printer Georg Michael Bauerkeller (1805 - 1886) and his half-brother Georg Leonhart Bauerkeller, who worked in Frankfurt am Main and in Karlsruhe before opening a printing and embossing office in Paris in the late 1930s.
[3] Georg Michael Bauerkeller deposited a patent application for his invention in France, in January the 18th, 1839.
[1] Laas d'Aguen, a supervisor of the institute, reinforced the printed maps by embossing additional layers of blank paper using the same platen, so the paper sheets would stick together creating a rigid cardboard material.