The observatory of the Crossbai-expedition of <a href="https://en.wikipedia.org/wiki/Max_Robitzsch" class="extiw" title="en:Max Robitzsch">Max Robitzsch</a> and Kurt Wegener, who undertook numerous meteorological weather balloon launches here. Only known published photo, from 1913.
Max Robitzsch
1913
<a rel="nofollow" class="external text" href="http://www.dmg-ev.de/gesellschaft/publikationen/dmg-mitteilungen_archiv/2001_2/2001_2.htm">Internet</a> via <i>Wegener, K., 1914, Das Observatorium in der Crossbai 1912/1913. Schriften der Wissenschaftlichen Gesellschaft in Straßburg, 21. Heft, 21-29.</i>