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CHAPTER VI. SCREENS
(1) From the audience point of view the function of a screen is to reflect the projected picture in the most pleasing manner. Technically this calls for a number of things : (a) It must deliver to the audience the largest possible percentage of the light incident upon its surface; (b) it must do this with a minimum fadeaway at side angles and (c) it must oppose a minimum interference to sound volume and distribution.
These are characteristics that should be required when purchasing a new screen to assure a full measure of efficiency during its life in the theatre.
Reflecting Surfaces
(2) The efficiency of the screen in reflecting light is of great importance. If it fails, either the beauty of the picture will be damaged or it will require increased power (light) consumption to give the picture full screen values. This greater power consumption will soon assume sizable proportions in the theatre's overhead expenses.
(3) In selecting a screen, bear in mind two distinct factors — one, the total percentage of incident light reflected and two, its distribution. (4) Measurement in a single direction is no proof of the total reflection power of a surface. A screen surface that has high efficiency in a 25-foot wide auditorium might be extremely inefficient in one 50 feet wide.
(5) Reflection power is affected by (a) character of surface, (b) color, (c) cleanliness, and (d) its age. The surface reflecting the greatest percentage of incident light, other things being equal, is pure white. (6) However, not all pure white surfaces have equal reflection power. There is density and character of the surface to consider.
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