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2 HANDBOOK OF PROJECTION FOR
less satisfactory performance with a production of far superior merit; and since inferior screen results must inevitably react unfavorably on future ticket sales, it follows that careful work and expert projection knowledge has direct value to the box office through increased patronage of the theatre.
Not only is this true, but the well informed projectionist is in a position to effect material saving in projection room expenditures, both in the matter of daily operating expense and in better and longer service of equipment. This latter item may be a very large one indeed, if we include the possible saving in film damage through intelligent adjustment of the machine tensions and intelligence in the matter of rewinding and handling of film, remembering that all film damage must, in the last analysis, be charged back to the theatre in the form of increased film rentals made necessary by added overhead expense to exchanges through frequent purchase of prints to replace those ruined by unintelligent handling.
With these facts in view we may readily understand the importance attached to the study of the details of his profession by the projectionist, and this book is designed primarily to supply detailed information, in plain words and understandable form, concerning those many things the competent, modern projectionist should and must know.
We shall labor hard to produce the best book possible, but have no hope of attaining perfection. The work is a large one and it is inevitable that some errors — minor ones only, we trust — will be found in its text. These we ask you to view with charity, remembering that few tilings in this world of ours are perfect.
PRACTICAL THINGS OF GREATEST IMPORTANCE.— This book, like its predecessors, is designed for the use of practical men, hence, as in past editions, we shall pay very much more attention to practical things and understandableness, than to absolute technical correctness. Strict technical correctness, especially in matters electrical and optical, often involves the use of a maze of words and technical terms, many of which latter could not possibly be understood by the ordinary man without such long-winded explanations that the novice would become confused and discouraged.
Therefore, when we are able to make a point sufficiently clear for all practical purposes merely by the sacrifice of some unimportant point of technical correctness, we shall unhesitatingly do so, believing that course to be, all things considered, best.