Excerpt from Projecting Sound Pictures: A Practical d104book for Projectionists and Managers

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 that many 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.

To make this possible, an easy, colloquial style is employed, as unlike the usual textbook style as the author could make it.

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