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532 JAMES A. MOSES November
It, too, is constructed in accordance with component requirements and is suitably protected against corrosion, fungus and high humidity conditions.
The loudspeaker (Fig. 4) is an 8-in. permanent-magnet cone speaker which has withstood all tests with regard to mechanical strength, vibration and shock. The case-deadening material utilized is glass fiber pads forming an acoustic sound-deadening material impervious to the effects of extreme temperature, humidity or fungus.
Close attention has been paid to operational convenience throughout the entire design and the threading of the projector is straightforward with a minimum number of sharp turns. Three basic features have been incorporated into the projector for greater convenience. They are: (1) location of a threading knob on the side with index marks to indicate when claw is projecting, thereby facilitating matching the perforations to the shuttle teeth ; (2) lower loop length adjustment is provided by a small diagonally facing knob located under the intermittent and change-over housing. This device permits correct presetting of the lower loop for film having varying degrees of shrinkage or wear; (3) an exteriorly operated loop setter. The lower loop can be reset while the projector cover is closed by pressing the reset button on top of the projector. As has been noted above, almost all of the components are removable as assemblies. Where such is not the case, they are mounted on sub-panels to allow movement without wiring discontinuity.
The projector proper is operative from either direct current or alternating current of voltage ranges from 105 to 129 v. The amplifier is a 60-cycle a-c unit operating over the same voltage range. A converter is required where direct current is the normal supply. The projector and amplifier will perform satisfactorily on either 50 or 60 cycles without change of the mechanism and the equipment performs equally well at both frequencies. The projector motor itself utilizes an electrical centrifugal governor for its speed control, the cooling or associated motor not being governed but of the same essential electrical components as the projector motor.
The projector is provided with a one-point central lubrication system containing an oil supply adequate for 100 hr of continuous operation. The intermittent shuttle and cam are supplied by this oiling system and no grease is required for their operation.
The electromagnetic change-over system functions without relays and is motivated by a press button located in the rear of each projector on the switch panel. By these means projector change-overs are