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The Development, Design and Construction of Gliders and Sailplanes (1931)

NASA Technical Reports Server (NTRS) · leaf 46

An illustration from The Development, Design and Construction of Gliders and Sailplanes, 1931, leaf 46 — Fig*34 Dynamic soaring flight as inversion of flapping flight.

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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$An illustration from Opticks, or, A treatise of the reflections, refractions, inflections and colours of light (1721)$