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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