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Important Foreword
MODERN projection covers such a huge field that to treat it and all things allied to it in exhaustive detail would require a book of very much more than a thousand pages. Such a volume, besides being expensive in price, would be unwieldy, easily injured and in every way awkward. Dividing the work into two or more volumes has very serious objections, hence, in what we believe to be the best interests of all concerned, the following plan has been adopted for keeping both size and price within reasonable limits.
In dealing with both electrics and optics there are many things which need not necessarily be understood in large detail by the projectionist, and which comparatively few would study, even though they be set forth in detail in this book. In such matters we have decided to give the essential facts as briefly as may be and refer our readers to other readily available standard text books for details.
We will, however, so far as possible, confine such references to books which the projectionist is likely to already own, or which he may consult in almost any public library. We believe our readers will heartily approve this plan, because, while causing no hardship, it will reduce the handbook both in bulk and price.
The "Hawkins' Electrical Guides," by Hawkins, and "Optic Projection," by the Professors Gage, will be used for reference wherever possible, because these most excellent works are already in the library of many projectionists and should be owned by them all.
Quite a little of what may seem repetition will be found in this book. This is because it is found necessary to mention certain things in several different connections, and to do so by cross reference would not always serve the best purpose. There is no duplication except in cases where the author believed duplication would serve the best interests of the users of the book.
THE AUTHOR.