Nikola Tesla Books
for pictures of a number of famous persons taken in Tesla'a laboratory, and many cooperative efforts. I am similarly indebted to Miss Marguerite Merington, a life long friend of Tesla.
Helpful bibliographic aid has been extended by Florence S. Hellman, Chief of the Division of Bibliography, Library of Congress; Clive B. Kennedy, Research Librarian of the Public Information Center, National Electrical Manufacturers Association; A. P. Peck, Managing Editor of the Scientific Americab; Charles F. Plaging and Myrta L. Mason.
I have received helpful cooperation from G. Edward Pendrey and his associates in the Westinghouse Electric and manufacturing Company in reading and correcting several chapters. I am indebted to Professor Emeritus, Charles F. Scott, Department of Electrical Engineering, Yale University, an associate of Tesla in the Westinghouse laboratories for several helpful conversations; to Hans Danlstrand, of the Allis Chalmers Manufacturing Company for technical data concerning Tesla's turbine experiments with that company; and to W. D. Crow who designed the Tesla Tower on Long Island, and to Randall warden, whose father provided the land.
I have received photostats of articles from William L. Laurence, of the New York Times, and E. B. Fitzgerald.
I have also been aided in various ways by Mrs. Grizelda M. Hobson, widow of the late Admiral Hobson; W. Urden Spencer Brown, president of the Brown Research Corporation, G. H. Clark, of the Radio Corporation of America; Mrs. Mabel Fliescher and Carl Payne Tobey.
My greatest debt, not only for extended secretarial service, but for critical judgement of my manuscript, is to my daughter, Peggy O'Neill Grayson.
To all of the foregoing I extend my most sincere thanks.
John J. O'Neill
