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Note on Page 5 * L. Prandtl. 3rd Intern. Math. Congress, Heidelberg, 1904.
Note on Page 7 * It is hoped that the results of these experiments will shortly be published.
Note on Page 7 † H. Blasïus, Thesïs Göttingen, 1907 (Zs. f. Math. u. Phys., 1908).
Note on Page 11 * B. A. Van Der Hegge Zijnen. Thesis Delft, 1924.