Ludwig Prandtl and his flume

Ludwig Prandtl (1875-1953) experimenting with his hand-made water tunnel, in Hannover, 1904. From “50-Jahre Grenzschichtforschung, eine Festschrift in Originalbeitragen” (Fifty years of Boundary Layer Research), edited by H. Goertler and W. Tollmein, Vieweg Verlag, Braunschweig, 1955. [Thanks to Prof. O. B. Widlund and the archivist of the Courant Institute, New York.]

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