Hot-air balloon by <a href="//commons.wikimedia.org/wiki/Category:Montgolfier_brothers" title="Category:Montgolfier brothers">Montgolfier brothers</a> (1783).
<a href="//commons.wikimedia.org/wiki/Category:Meyers_Blitz-Lexikon" title="Category:Meyers Blitz-Lexikon">Meyers Blitz-Lexikon</a>, Leipzig, 1932
<a href="//commons.wikimedia.org/wiki/Category:Meyers_Blitz-Lexikon" title="Category:Meyers Blitz-Lexikon">Meyers Blitz-Lexikon</a>, Leipzig, 1932