Formerly Professor of Physics, the University of Chicago
Director Norman Bridge Laboratory of Physics
California Institute of Technology
THE UNIVERSITY OF CHICAGO PRESS
CHICAGO, ILLINOIS
COPYRIGHT 1917 BY
THE UNIVERSITY OF CHICAGO
All Rights Reserved
Published August 1917
Second Impression February 1918
Third Impression November 1918
Fourth Impression December 1910
Fifth Impression February 1921
Second Edition October 1924
Composed and Printed By
The University of Chicago Press
Chicago, Illinois, U.S.A.
TO
ALBERT A. MICHELSON
AND
MARTIN A. RYERSON
THIS SMALL OUTGROWTH OF THEIR
INSPIRATION AND GENEROSITY
IS RESPECTFULLY DEDICATED
PREFACE
It is hoped that this volume may be of some interest both to the physicist and to the reader of somewhat less technical training. It has been thought desirable for the sake of both classes of readers, not to break the thread of the discussion in the body of the book with the detailed analyses which the careful student demands. It is for this reason that all mathematical proofs have been thrown into appendixes. If, in spite of this, the general student finds certain chapters, such as [VII] and [VIII], unintelligible, it is hoped that without them he may yet gain some idea of certain phases at least of the progress of modern physics.
R. A. MILLIKAN
May 18, 1917