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418 MOTION PICTURE HANDBOOK
brush tension spring is adjustable by putting the end of it in the different notches provided for it in the brushholder casting, and any degree of tension can be had by using the different notches.
4. Oiling. — The oil chambers should contain enough oil to give the rings a good dip. The oil level will be seen in the gauge on the sides of the bearings and should be merely at the top of the gauge. When starting the machine, lift oil chamber covers and see that the oil rings are turning freely and carrying oil to the shaft. The old oil should be drawn off by unscrewing the drainage plug at bottom of the bearing every month or two, and replaced with new oil. See General Instruction No. 3.
5. Setting of Brushes. — Machines are shipped from the factory with the brushholders and brushes properly set. The position of the brushes is approximately half way between the poles. In the motor, they are placed one or two segments back (that is, against the direction of rotation) of the exact middle or neutral point, while in the generator .they are set one or two segments forward. The brushholders should be placed on the studs, so that the brushes will not run in the same line on the commutator. This will help to avoid grooving.
6. Starting Set.— First see that the starting box lever has moved back to the off position. If there is a regulating rheostat on the motor end, its handle should be moved as far as possible in a contra clockwise direction. If there is one on the generator end, its handle should be moved as far as possible in a contra clockwise direction. Close the main switch and move the lever of the starting box over the contacts, taking about one second for each, until it is against the magnet which will hold it. If the set has not started when the fourth contact point is reached, open the main switch and ascertain the trouble. When the set is running, the current may be adjusted by means of the regulating rheostats.
7. Stopping Set. — Open the main switch and let the starting box operate itself. The lever will be released when the motor has slowed down, when it will fly back to the "off" position. If the contacts become rough and prevent the lever from moving fully back, they should be cleaned with very fine sandpaper. The lever should never be fastened or allowed to stick at an intermediate point.
8. Care of Brushes and Commutator. (See General Instruction No. 8.)