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GENERATORS 149
is to install it, is a responsible factor, and desin port the set by some other method, and is will to guarantee, in writing, against noise or vibration, such guarantee should be accepted.
Brushes
(66) Points of importance with relation to brushes
are: (a) they must fit their holders snugly, but not tight they will stick in their holders. | b ) they must relate to the machine in size and be able to cany its maximum current without heating; (c) when new brushes are installed they must be fitted accurately to the commul curvature. I 7 This last may be done by laying No. ]/2 sandpaper (never emery cloth or emery paper) on the commutator, the ends of the brushes resting on the sand side at normal brush pressure. Draw the paper forward in the direction of the commutator rotation, and repeat the operation until the brush ends tit the curvature perfectly.
If the brushes fit their holder snugly the job may be done more easily and quickly by drawing the paper back and forth until the brush ends are worn almost to the proper curvature. At the finish it is best to draw the paper a few times in the direction of the commutator ro tation only. It is a tedious job, but only needs to be done at long intervals.
Do not experiment with brushes. Use only those recommended by the manufacturer of the set.
The Commutator
The careful projectionist will pay close attention to the generator commutator. He will study its requirements and if something seems wrong will attend to it immediately. Sparking cannot always be eliminated entirely, especially if the machine is working close to capacity, but it should be reduced as far as Je. The instructions that follow are of great help.
(68) When there is little or no sparking and the surface is smooth, glazed and of a dark brown color it is