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OPERATING MANUAL 113
made of flexible Greenfield conduit and are permanently attached to the motor. When there is disk reproduction, turntable equipment is driven from the end of the motor opposite to the projector driving mechanism.
II. Motor Control Box
On the opposite side of the projector from the motor is the motor control box, connected with the motor byflexible conduit. The box has a knob, which is used to increase or decrease the speed when the switch is at variable operation. When the switch is thrown at regular operation the motor gives a speed of 1,200 R. P. M., and 90 R. P. M. at the flywheel of the projector, which runs 90 feet of film per minute, a standard footage of sound per minute.
The motor control box is provided with a milliammeter, and this milliammeter should show 5 to 20 mils after the machine is in operation. If this milliammeter does not register correctly, this is sometimes due to the line voltage conditions. A lead runs from the main switch to one of the primary taps numbered 2 to 6 on the transformer inside of the control box. If the line voltage is too low, or the meter reading is too high, or if the motor fails to come up to speed, move this lead to a lower numbered tap. If the line voltage is too high, or the reading meter too low, or if the motor tends to run away, move the lead to a higher numbered tap.
It is well to have the motor well warmed up by running ten to fifteen minutes before finally adjusting the rap connection.
III. Batteries
As mentioned in an earlier chapter, at the present time all Western Electric sound equipments use storage batter