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PREFACE ix
Jensen Eadio Manufacturing Co. (Figs. 27, 28, 28A, 105A, 115), Journal of the Society of Motion Picture Engineers (Figs. 7, 12, 30, 31, 32, 50, 53, 54, 59, 60, 61, 65, 66, 68, 69, 70, 74, 75, 89, 90, 98, 107, 117-123), J. A. Maurer, Inc. (Figs. 7 A, 7B, 25, 52, 58, 61A, 63, 63A, 63B, 71B, 71C, 80, 97, 99), Mitchell Camera Corp. (Fig. 26), Moviola Manufacturing Co. (Fig. 86), National Association of Broadcasters (Fig. 33), National Bureau of Standards (Figs. 116, 116A, 116B, 116C, 116D), Neumade Products Corp. (Figs. 77, 78, 79, 81, 82, 83, 87), Photographic Instruments, Inc. (Figs. 95, 96, 104), ECA-Victor Division, EC A (Figs. 44, 44A, 44B, 46, 46A, 46B, 48, 48A, 48B, 49B, 49C, 49D, 51, 64, 67, 71A, 100, 113), Shure Brothers, Inc. (Figs. 49, 49A), E. I. Sponable (Fig. 57), U. S. Navy (Fig. 110), I). Van Nostrand Co. (Figs. 34, 35, 36, 37, 40, 41, 42, 55), Western Electric Co: (Figs. 43, 43A, 43B, 45, 45A, 47, 47A, 47B, 55A, 62, 71, 114), Weston Electrical Instruments Corp. (Figs. 2, 3, 72, 72A, 73).
Thanks are also due to the Society of Motion Picture Engineers for permission to reprint in modified form material that appears in Chapters V, VI, IX, XI, XIV, and XV. Much of this material was previously published in its Journal by the author in the form of Society papers.
Although it is impossible to list all who have contributed professionally to the data in this book, special mention must be made of my fellow-engineer of many years, Dr. E. W. Kellogg. His influence as a catalyst in improving the quality and quantity of the work of all those with whom he comes in contact can be matched only by his own outstanding achievements in the field of sound recording. Special mention must also go to my old friend from Columbia student days, Hugh Knowles of Jensen. For years we have discussed 16-mm and what can be done to improve it. He is to be congratulated particularly for the excellent series of Jensen Technical Monographs that make loudspeakers and their performance comprehensible to engineers at large.
Mention must also be made of my friend and associate during the War, Lloyd T. Goldsmith of Warner Brothers, who in his continuous survey of the Hollywood scene is so keenly aware of the unusual things that are quietly being done there on the dayto-day job by the unsung scientific heroes of the picture production and equipment manufacturing industry.
The author is indebted to Harry Smith, Jr., former Secretary of the Society of Motion Picture Engineers for providing the spark that started this book. He also wishes to express his deep appreciation to Interscience Publishers, Inc., and especially to Mr. Allen Kent of their staff for understanding counsel and aid in producing this book.
Acknowledgment must also go to my good friend H. E. White of Eastman Kodak and to William Deacy, Jr., of the Society of Motion Picture Engineers in that necessary and taxing chore of going over the galley proof, and to my sister Marie for checking the page proof.
William H. Offenhauser, Jr. New Canaan, Connecticut September, 1949