Inside Out Library · ExploreRecent Experiments at the Gottingen Aerodynamic Institute (1925)NASA Technical Reports Server (NTRS) · leaf 252-5 Figs.3&4 N.A.C.A. Technical Memorandum No.323NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Recent Experiments at the Gottingen Aerodynamic InstituteMore like this
