Design from 1873. It depicts an airship that never took flight. "Passenger rigid airship project by Spiess in the illustrated X-ray image and with the distribution of gas-filled balloons in the rigid envelope."
Leichter als Luft – Ballone und Luftschiffe von Haaland, Knäusel, Schmitt & Seifert, S. 92
December 12, 1913. First outing of the airship "Spiess." 200-kilometer raid.
Université de Caen Basse-Normandie Quelle
