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The authors are under great obligation to all of their friends who have assisted them in this work, particularly to their collaborator, Mr. W. R. Pyle; also to Mr. J. R. Towne of East High School, Minneapolis, Mr. C. F. Dutton, of the West High School of Commerce, Cleveland, Mr. E. Waite Elder, of the Eastside High School, Denver, Mr. C. E. Harris, of the East High School, Rochester, N. Y., Mr. Walter L. Barnum and Mr. Robert E. Hughes, of the Evanston High School, Evanston, Ill., and Dr. George de Bothezat, aëronautical expert of the Advisory Commission for Aëronautics.
R. A. MILLIKAN
PORTRAITS OF PHYSICISTS AND ILLUSTRATIONS
OF RECENT ACHIEVEMENTS IN PHYSICS
9. French 340-mm. Gun in Action