F. H. Richardson's bluebook of projection (1935)

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SCR1 55 on the screen represented by A-B. An observer seated at C will see this object in its normal width, but an observer at D will not. 1 Ie will instead see it a of B ( . width. This effect is present in varying degree from any viewing angle, but is only objectionably noticeable when the viewing angle becomes sharp. Figure 50 (33) No screen surface can remedy this condition. Reducing the viewing angle is the only remedy. When there are viewing angles such .as shown in Fig. 50 exhibitors should install a screen of high diffusion power. As a matter of fact such angles should not exist in any motion picture theatre. (34) According to Table Xo. 6 on page 150, the only screen for the theatre layout previously mentioned would be E. True, B is a trifle better in the matter of light distribution, but it is weak in reflection power. We need a surface approximating E in diffusion power, with the highest reflection power possible. Screen Mounting (35) The best screen mount is a strong frame with metal hooks, metal eyelets, and a rope lacing. It keeps