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reflections and reverberations in the projection area provide serious obstacles to the hearing of highly intelligible sound.
This situation, however, is not unlike that in many industrial areas where loudspeakers are used for public announcing involving coverage over a wide area of enclosed space. Experiments are continually being made to solve the acoustic problems involved. Various types of loudspeakers and loudspeaker systems are being tested in order to procure a more satisfactory final result.
A perfect theater can never result from the efforts made in this direction since the spaces allocated for motion pictures on ships have to fill their primary combat functions first, and can be adapted only secondarily for motion pictures. This, then, means that sound deadening material must be held to a minimum. Inflammable materials are absolutely out, no matter how good their acoustical properties may be.
Only one 20-w amplifier is used to cover the hangar area and to feed the booth monitor loudspeaker. From Fig. 7 it will be seen that both projectors can be fed to one or the other of the amplifiers. Two projectors feeding into one
amplifier can be instantaneously shifted to the input of the stand-by amplifier in the event of the failure of the working amplifier. Should other peculiar conditions arise, each projector may feed into its own amplifier with both amplifiers individually feeding into the same overhead loudspeaker system. The switches which accomplish this change are identified by the numeral 9 in the center of the figure. In this manner we have attempted to provide a system of maximum flexibility because the conditions of use are subject to change without notice, depending almost entirely upon the number of persons attending the show; that is to say, of the amount of acoustic or sound absorption material present in the hangar bay area. This, of course, would be in addition to the change of film itself.
References
1. Lowell O. Orr and Philip M. Cowett "Desirable characteristics of 16mm entertainment film for naval use," Jour. SMPTE, 58: 245-258, Mar. 1952.
2. "Tentative recommendations for 16mm review rooms and reproducing equipment," Jour. SMPTE, 56: 116-122, Jan. 1951.
July 1953 Journal of the SMPTE Vol. 61