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1950 16-MM ARMY PROJECTORS 531
treated so as to afford the maximum protection from corrosion. The use of aluminum affords a weight reduction which is essential in order to meet the portability requirements and still have adequate strength and minimum vibration.
The general design of the projector (Fig. 2) is such that it features replacement by assembly and subassembly, it being understood that a motion picture projector is essentially a precision device and that frequently personnel involved in the maintenance of the projector would be insufficiently trained to make a basic mechanical replacement where such replacement involved a high degree of mechanical skill. This resulted in making an assembly of the motor and gearbox and a major assembly of the soundhead, so as to allow storage of this unit
Fig. 3. AN/PFP-1-Q Amplifier Component; cover removed, showing location of photocell cable, changeover harness and bridging cable.
and rapid replacement where the essential film and test instruments are not available for its correct alignment after repair.
The shuttle and cam comprising the intermittent movement are accessible from the front of the projector and can be replaced by relatively inexperienced personnel in less than a half hour. Further, it is unnecessary to remove any other part of the projector mechanism in order to gain access to the intermittent. This system is designed to permit film movement with two damaged or torn perforations and framing of the picture on the screen without shift of the projected aperture.
The amplifier (Fig. 3) features complete accessibility for replacement of defective parts or for checking of its performance electrically.