In 1894, the German industrialist Carl Berg procured a contract to build an airship for the Royal Prussian government, referring to Schwarz as the originator of the idea [REF].
Due to delays, the airship was first filled with gas and tested on 9 October 1896, but the results were not satisfactory because the hydrogen gas delivered by the Vereinigte Chemische Fabriken from Leopoldshall (part of Staßfurt) was not of the required purity and did not provide sufficient lift.