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1950 16-MM ARMY PROJECTORS 529
minimum of three years; (2) factual experience had proven that maintenance demands increase with the age of the equipment.
The JAN P-49 Specification was used as a basis for the Signal Corps Development Specification SCEL 4001. On May 2, 1946, a contract was awarded to the DeVry Corporation for development of a 16-mm projector designed primarily for Army use. Experimental models of this equipment were delivered to the Signal Corps Engineering Laboratories in December, 1947, where subsequent engineering tests resulted in a number of minor modifications. In January, 1950, modified test models were received by SCEL and these were made available for extensive service tests which were conducted under cognizance of Army Pictorial Service Division, Office of the Chief Signal Officer. Accumulation of the test data was effected by a series of tests held at Fort Myer, Fort Belvoir, Fort Meade, Fort Monroe and the Pentagon. An attempt was made to observe and evaluate the performance of the test models under all available conditions presently required by the Army. Continued use of the test projectors, under varied conditions, indicated improvements in light and sound output, sound fidelity and maintenance facilities. Such characteristics permit improved projection, in Department of the Army theaters, recreation halls, etc., to large audiences. The test models were used for both single unit and dual projection to various size groups, in film library projectionist schools, in film library maintenance shops, and were issued to units for showing Army training films under actual classroom conditions, in exactly the same manner as is employed for utilizing present 16-mm equipment.
A " Questionnaire" was prepared and issued to all units testing the new models. This form requested the users to indicate either "satisfactory" or "unsatisfactory" about the following: picture brightness and image quality on matte screen, sound quality and volume; ease of threading; ease of adjusting projection lamp for maximum uniformity and brightness; lens focusing adjustment; tilt adjustments, rewinding operation; switching arrangement and convenience in operation; change-over operation, amplifier controls; lower loop setting device; framing adjustment; picture gate closing; noise of projector mechanism; flutter content; installation, servicing, cleaning and/or sufficiency of projection and exciter lamps, condenser and projection lens, aperture and pressure plates, sprockets and rollers, fuses, belts, reel arms and attaching cables; size, weight and ease of carrying; and over-all physical design and construction of the equipment.