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122 SOUND MOTION PICTURES
Oil the hole in the hub at the inner side of the fibre driving gear. (On some designs this oil hole is replaced by an oil cup on the end of the main horizontal shaft.)
Oil the cup behind the fibre driving gear at the right. Oil the cup behind the driving gear at the left. Oil the cup on the spindle of the tension pulley for the take-up drive.
Oil the guide roller above the attachment sprocket. Separate the two halves of the roller by springing them apart with the fingers in order to get the oil to the centre of the spindle. Oil the sprocket pad roller on the arm. Oil the idler roller below the sprocket. When the equipment is on a Simplex Projector, give the grease cup on the upper gear box a full turn. If necessary, refill with the grease furnished. Occasionally check to see that the grease channel is clear by turning the grease cup till grease is seen to come out beside the driving pinion inside projector.
4. On the two machines, set up two copies of one of the test records, or thread two prints of one of the test films, exactly as described in the next section (Setting
up).
5. On each motor control box see that the regular switch is set at "Regular."
6. Set up the operator's and the observer's telephone sets. The manager, or someone else qualified to judge whether reproduction through the theatre horns is satisfactory, should now go into the theatre and stay within easy reach of the observer's telephone.
7. Start the first projector by means of the starting switch on the motor control box of the line switch for the motor control box.
8. Observe the reading of the meter on the control box. After the machine is up to speed the reading should vary somewhere between 20 and 30 mils, on A. C. supply; or 50 and 70 mils, on D. C. supply.