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THREE-DIMENSIONAL MOTION PICTURES each motor would operate from its regular switch. The fuse or circuit breaker capacity would have to be changed to take care of the dual operation. Extreme caution must be used by the projectionist to avoid elec trical or mechanical trouble due to operation of switches. OPERATION OF INTERLOCK If the above instructions are followed it should be possible to start and stop the machines,, by means of the common switch, several times with the sync indicators slopping together each time. In case a dark wedge should stop in the vertical in case a dark wedge should stop in the vertical posi tion on one machine, it is only necessary to turn the machine by hand to match the numbered sector on the upper sprocket of the other machine before threading. A test loop (two identical loops are required) for each machine can be made by using numbered leader stock and running through the machine as continuous loops. The numbers from each projector should flash on the screen at the same instant* A difference of one frame is difficult to detect and if the machines are out of sync two or more frames the time lag is very evident. It is important that the machines never be out of sync more than one frame. MAINTENANCE. The sprocket chains should be operated with very little, if any, slack. Apply a little projector oil daily to the chains and universal joints. Maintain proper oil level in gear boxes. Too much lubri cant may cause them to overheat. After 500 hours of operation the gear boxes should be drained, cleaned with kerosene and refilled with new oil. When changing from 3-D to conventional projection, loosen screws holding gear box brackets and remove chains. For the next 3-D showing it will be necessary to repeat the synchronizing operation-