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HANDBOOK OF PROJECTION FOR
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SURFACE A
projection department of the Moving Picture World, and possibly (if they care to do so) in other trade papers, and such additional data may be clipped out and tipped into this book at the proper place.
Reflective Powers of Screen Surfaces. — The general idea is to enable reputable screen manufacturers to supply to you, and if necessary to force other manufacturers to supply reliable data on the reflection powers and characteristics of the surfaces they propose to sell to you. By the use of this data the exhibitor or projectionist is enabled to make intelligent selection of the screen surface which will have the highest reflective value coupled with the distribution best suited to his auditorium, which two factors form the points of basic importance in screen surfaces. Having determined which surfaces will give you best general results, it then is merely a matter of initial cost price, probable length of time the surface and its backing will give efficient service, and possibility of renewing the surface without prohibitive cost.
On behalf of exhibitors and projectionists, as well as on our own behalf, we wish to most cordially thank the Eastman Kodak Company and Lloyd A. Jones for this splendid contribution to the industry.
Reflection Factor Explained—The ability of a surface to reflect light which falls upon it is expressed in terms of its reflection factor. This is defined rigidly as "the ratio of the luminous flux reflected by the surface to the luminous flux