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372 MOTION PICTURE HANDBOOK
the lubricating quality of the oil will be very greatly impaired. Dirty oil is often the cause of bearings heating.
General Instruction No. 5. — Cleanliness. It is important that all parts of motor generators be kept scrupuluosly clean. Oil should not, under any circumstances, be allowed to collect, either on the machine or on the floor near it, and the machine should, so far as possible, be kept free from dust. A medium size hand bellows will be found very convenient for removing dust from the armature, from around the pole pieces and in other inaccessible places. A dirty machine is evidence of a lazy, indifferent of incompetent operator.
General Instruction No. 6. — Loose Connections. It is highly important that all electrical connections and all bolts and nuts be inspected periodically and carefully tightened up, and all electrical connections be kept not only tight but perfectly clean. Loose connections are a continual source of absolutely unnecessary trouble.
General Instruction No. 7. — Ammeter and Voltmeter. All motor generators are or should be provided with both voltmeters and ammeters, and they should by all means be located on the wall in front of the operator as he sits in operating position. It is a serious mistake to install a voltmeter and ammeter in an out of the way place. They should be constantly under the operator's eyes, since there are points at which the arc furnishes maximum illumination with minimum current consumption, and with the ammeter directly in front of him the operator soon learns where he gets the most light with the least current consumption and, if he is a capable man, keeps his arc at that point.
General Instruction No. 8. — Care of the Commutator. The commutator of a direct current motor or generator ought to require very little care, but sometimes does require a great deal.
The best evidence the commutator is in Al condition is a sort of glazed appearance, smooth as glass, a brownish shade in color and a slight squeak from the carbon brushes when the armature is revolved slowly. To obtain and maintain this condition the following care must be given:
(a) The brushes kept set as nearly as possible at the sparkless point, which point may, with the old style generator lacking the inner or "commutator" pole, vary with the load. On the newer type of generator the inner or commu