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Characteristics of Screen Surfaces
WHEN we first started work on the Fifth Edition it was realized that such data as were available concerning the various screen surfaces now being used were too old to be of any practical value. We therefore approached Mr. Lloyd A. Jones, of the Research Laboratories of the Eastman Kodak Company, asking if he would consent to make tests of all screen surfaces which might be submitted by manufacturers at our request.
After consultation with the Eastman officials he agreed to do this, with the understanding that the tests were being made primarily for the Fifth Edition of my books, but that they would be available for publicai:on by any trade paper which might wish to use them. The purpose of the tests was to determine the relative reflection powers of each of the surfaces now in use, in every direction up to a fifty degree angle with the plane of the surface of the screen.
Inasmuch as paint and kalsomine surfaces, much in use for screens, are very familiar to us all, we requested Mr. Jones to test these surfaces also, since they would afford a most excellent medium for comparison of the reflection and diffusion of other sufaces.
The purpose of all this is to protect the projectionist and exhibitor by enabling them to have thoroughly reliable data concerning the characteristics of the various screen surfaces, and thus to be able to select the one which will have maximum efficiency in any given theatre auditorium. All screen manufacturers were invited to send samples of their screen surfaces for test.
Important — Similar tests of new surfaces, provided they be sponsored by reasonably responsible individuals or concerns, may be had at any time by forwarding samples twenty-four inches square, stamped on the back with the trade name under which it will be marketed, to the author of this book, care Moving Picture World, 516 Fifth Avenue, New York City.
These tests of course take no notice of the general construction of the screen, or of the probable tendency of its surface to deteriorate, discolor or become dull. Those various things must be judged by the buyer, however we strongly advise projectionists to refuse to recommend for purchase, and exhibitors and theatre managers to refuse to purchase any screen which has not been submitted for test, and the results of the test made public.
Note: It will of course, in the nature of things, be impossible to keep right up to date in the matter of publication of the tests made of new surfaces in this book, but the result of any tests of new surfaces made will be published in the
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