Projecting Sound Pictures
by Aaron Nadell (9781406747157)

Projecting Sound Pictures
Aaron Nadell
Release Date: 01 March 2007
Format: Paperback
Pages: 276
Category: Physics
ISBN: 9781406747157
ISBN-10: 1406747157

PROJECTING SOUND PICTURES A Practical Textbook for Projectionists and Managers BY AARON NADELL. Publix Theatres Corporation Formerly of Electrical Research Products, Inc. FIRST EDITION SIXTH IMPRESSION McGRAW-HILL BOOK COMPANY, NEW YORK AND LONDON 1931 LIMITS OF HUMAN EAR SENSITIVITY WIND INSTRUMENTS STRING INSTRUMENTS HUMAN VOICE U o u t A-COWSTAHT DENSITY VARIABLE AMPLITUDE R. C. A SOU WO TRACK B-VARIABLE DENSITY CONSTAI1T AMPLITUDE WEST. QEa SOUND TRACK ABAB AB AB Chart showing the relationship between the pitch of sound as heard, and the frequencies of the consists. Showing also the pitch and frequency range of the human voice and of some of the Indicating, lastly, the relationship between sound frequencies and the appearance of photographic recorded. PREFACE This book has been prepared on a very definite plan, which should be made clear to the reader at the beginning. It is intended primarily for the practical theatre man the projectionist who is responsible for the operation of sound equipment, and the manager who is responsible for its bills. It aims to present, in everyday English, a practical and commonsense understanding of the why behind the operation of sound apparatus. The book not only very definitely tries to do certain things it just as definitely tries to avoid doing certain others. For example, electrical phenomena are very largely explained, in these pages, according to the electron theory of the nature of currents. This theory is extremely simple, and absolutely necessary for forming a mental picture of the operation of such parts as tubes and photo-electric cells. On the other hand, it is seldom used in explaining the action of commoner electrical apparatus, so thatmany projection ists, whose electrical knowledge is otherwise very good, have never heard of it. Therefore it seemed desirable, in dealing with this theory, to begin with its first elements and as a result the manager who may know very little about electricity and the projectionist who has been working with it for years can start on a more even footing than would otherwise be possible. Technical terms are used throughout their meaning is part of the information this book aims to convey. But the reader need not know them to understand the book, or trouble to memorize them as he goes along. Every term is introduced, for the first two or three times, in such context as makes its meaning self-explanatory, and it is believed that the reader who simply reads the book as if it were a novel will acquire a technical vocabulary without conscious effort. Vi PREFACE To make this possible, an easy, colloquial style is employed, as unlike the usual textbook style as the author could make it. It is the principles behind sound results that are dealt with, but they have been most solidly linked with practice, as is fitting in a volume intended for practical men. Thus, while two full chapters are devoted to repairs and precau tions, it seemed desirable, in mentioning many principles, to mention at the same time some of the more common troubles and their cures involved in the application of those principles. It was felt that by thus intimately tying up theory with detailed procedure in the projection room, the practical value of the book would be increased far beyond any loss that might be suffered through interruption of the flow of narrative. Every theory dealt with has also been followed by descriptionof some of the more ordinary ways in which it is applied in the construction of practical apparatus. The many pictures used have been carefully chosen for the same purpose to illustrate the number of very different ways in which some principle, mentioned in the adjoining text, can be applied in equipment, and thus to help the reader to understand its application in the equipment of his own projection room...

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