Inside Out Library · ExploreExperiments with Rotating Cylinders in Combination with Airfoils (1926)NASA Technical Reports Server (NTRS) · leaf 10N.A.C.A. Technical Memorandum No.382 Figs.l & 4NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Experiments with Rotating Cylinders in Combination with AirfoilsMore like this
![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten06unit-988-0.webp)
