Large original technical drawing in projection 635 x 560 mm in Indian ink on Canson type paper, produced by the student A. Mourthaux at the Ecole Supérieure d'Aéronautique, undated (ca 1920).
It represents in projection the longitudinal, bottom, front and rear view of an airship.
Technical characteristics in the center: Total length: 105 meters – Maximum diameter: 15 meters – 5 meter propellers – Number of engines: 2 – Power of each engine: 200 HP – Length of the nacelle: 48 meters.
Central horizontal and vertical folds, foxing, beautiful example of great finesse of execution