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534 JAMES A. MOSES November
picked up by a prismatic type of light pipe and transmitted to the rear of the soundhead casting where it is reflected to the lead sulfide photocell, which is rigidly mounted on the soundhead casting, thus eliminating all photocell microphonics.
It is fitting, at this point, that credit be given to the Society of Motion Picture and Television Engineers and its committees for making available to the Armed Forces and to industry a fine series of test films without which the projection equipment just described could never have been developed, since it is essential first to have the tools for measurement before any product can result.
The improved features contained in the equipment just described did not come about by mere arbitrary action, but each is the result of considerable study regarding the relative potency of particular requirements. Throughout the entire development program, however, two factors have been carefully considered. These are: (1) maintenance of Army 16-mm projectors had been difficult and costly because of the lack of assemblies and subassemblies. This condition was further aggravated, in many cases, by the absence of qualified projector repairmen; (2) average attendance and conditions under which films are projected in the Army show definite needs for greatly increased sound and light output and higher sound fidelity. It should be re-emphasized that factual information resulting from evaluations made during what was the largest full-scale training, educational and entertainment film program ever undertaken, has provided immeasurable guidance on many matters pertaining to development of the Projector Set AN/PFP-1. Perhaps unsatisfactory showings of entertainment films to groups of two thousand men in New Guinea or lack of adequate sound or illumination during the showing of training films in the Post Theater at Camp Hood, are partially responsible for increased sound and light output in the new design. Low voltages encountered in the Mediterranean, or the South Pacific, undoubtedly played a major role in the provisions for a compensator for fluctuating and low voltages.
The postwar period has made some interesting and helpful contributions, too. Continued increases in Regular Army film usage, together with that of National Guard, Organized Reserves and ROTC, further indicate the requirement for 16-mm equipment with greater sound and light output. Utilization data obtained by a consolidation of Film Library Reports for the period from October 1, 1949, through December 31, 1949, shows that Signal Corps films were shown more than 228,000 times to audiences totaling more than