Drawing architect 1930 vault of ridges tiercerons and liernes

Authentic and old architect's drawing in indian ink and watercolor of the 1930s entitled "arch of edge with tiercerons and liernes - plan and elevation" signed j. Duponcheel in the lower right corner. Entirely handmade on thick paper. The format is 50/72cm or +- a b2. Made by a draftsman from the industrial and commercial school of mouscron in 1933 and the saint luc school in tournai in 1933. No tears... Blank back; in good condition (see photos) Art drawing of 90 years to put under frame and to exhibit... Armored shipment under cardboard and waterproof tube. Other templates available in my other objects.