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Author's Note
ALL matter dealing with equipment, the use of -*^ equipment or with technical matters which is contained in this work, has been examined by and has the approval of the engineering department of one or the other of the equipment manufacturers or producers concerned. You may therefore feel assured that in so far as has to do with equipment and technical matters, everything herein contained was correct at the time of its compilation.
However, let it be clearly understood that since new equipment is involved, and new theories as well, with both still in some measure in the formative stage, changes and improvements which may alter the correctness of some sections of such a work as this cannot be wholly guarded against.
It will be said, however, that it is not the intention to include those things which seem likely to be subject to much change.
It will be noted that I have included in this work certain articles descriptive of various elements of sound apparatus already published in the projection department of the Exhibitors Herald-World, The American Projectionist and in Movietone Bulletin, of which publications the author of this book is, at this writing, editor. For this no apology is either necessary or offered. The information and instruction contained in those articles is essential to the completeness of a work of this sort, and I feel that they could not be materially improved upon as originally written. You will now have them in convenient bound form for reference and further study.