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ACKNOWLEDGEMENT
It gives the writer great pleasure to acknowledge the aid given so freely in the preparation of this book by many individuals and firms. The preparation of the book itself, and the arrangement of the material was accomplished with the help of the officials of the Amateur Cinema League, Col. Roy W. Winton, Walter D. Kerst, J. B. Carrigan and Arthur L. Gale. Mr. Stephen L. Sturz of Willoughby's, Incorporated, and the firm of Herbert and Huesgen also gave valuable information in this first step.
The manufacturers gave freely of their time during the writing of the first part of the book, Charles Bass, Bell & Howell, Mr. H. A. DeVry, The Eastman Kodak Company, and Mr. A. F. Victor doing everything possible to further the work.
The chapter on lenses and optical accessories was made possible by the information supplied by the C. P. Goerz American Optical Company, Hugo Meyer and Company, Wollensak Optical Company and Carl Zeiss, Incorporated.
The experimental chapter is due to the cooperation of Mr. W. A. Shoemaker, editor of the Cine Kodak News and of Mr. E. M. Tobias of the DuPont-Pathe Film Manufacturing Corporation. The data on tinting and toning was supplied by the Eastman Kodak Company.
Data on arc illumination was supplied by the M. J. Wohl Company and by Mr. Leonard Westphalen. Mr. Burleigh Brooks assisted in securing filter data, Mr. Ralph R. Eno helped to prepare the title material, Miss Vera L. Standing supplied the scenarios, while the material regarding Filmslides was given by E. Leitz, Incorporated.
Many technical points, concerned with exposure, development, printing, camera speed and projection would have been impossible without the help of Mr. Joseph M. Bing of the Drem Products Corporation, and Mr. R. P. Stinemann.
And last but not least, great credit is due the officials of the New York Institute of Photography, who gave unfailing assistance and who placed the entire facilities of their splendid studios at the disposal of the writer during the preparation of this work.
Herbert C. McKay. v