Gondola of the 'Bartsch von Sigsfeld' high-altitude research balloon

Gondola of the 'Bartsch von Sigsfeld' high-altitude research balloon
Gondola of the German Aviation Research Institute (DVL)'s Bartsch von Sigsfeld high-altitude research balloon, with sandbags and testing equipment. The photograph shows the DVL stand at the International Aviation Exhibition in Berlin in 1928.