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608 PROCESS PROJECTION EQUIPMENT [j. s. M. P. E.
PART vni Noise Level
Maximum Noise Level (Basic): Considering noise measurements made at 45° positions about the projector and at a distance of 6' from the projector, using a meter which employs a 40 db ear loudness weighing characteristic and calibrated with respect to the standard reference noise level of 10 ~16 watts per square centimeter, the maximum allowable noise level from the whole equipment shall be 34 db.
PART IX
The Translucent Screen
Base Composition (Basic) : All screens shall be made with a SAFETYTYPE base — cellulose acetate or an equivalent comparable to clear base acetate film — this base to be of such quality that no discernible color change is noticeable over a two-year operation period. When a diffusion surface is applied to the base, this surface should be readily removable so that the screen may be easily refinished in the event the surface is damaged.
Light Transmission, Field, Definition (Basic): The screen, over its entire area, shall be so designed as to provide : (1) optimum transmission (see above paragraph) ; (2) optimum diffusion, diffraction, or refraction characteristics; (3) as flat a field as possible; and (4) uniform definition. Standard Screen Sizes (Basic): The Committee recommends that motion picture producing companies, manufacturers, and commercial organizations engaged in process and miniature work standardize upon the following screen sizes (specified as usable inside area, exclusive of binding) :
Height Width Height Width
5' X 7' 16' X 21'
8' X 10' 18' X 24'
11' X 14' 24' X 3C'
14' X 18' 27' X 36'
PART X
Screen Illumination
Standard Method of Measuring Screen Illumination (Basic): The following method of measuring the amount of light falling on a screen is recommended: The full screen aperture of the projection machine is flashed with the shutter open and stationary. Nine readings of the light intensity are taken at different points on the projection side of the screen — the four corners, the middle of the top and bottom and the two sides and the exact center of the image. The measurements at the corners and edges are made by placing the center of the cell in from the edge 5% of the total width and in from the top and bottom 5% of the total height of the projected image. The exact height and width of the projected image