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394 MOTION PICTURE HANDBOOK
armature will show at once by the excessive heating, and perhaps smoking of .the coil or coils short circuited and if the machine is continued in operation it will be burned out. Where trouble of this kind is suspected the necessity of prompt attention by an electrician is obvious.
Overload: If considerably more current is being taken by the lamp than the machine is designed for, sparking may result. See that the machine is not excessively overloaded.
Brushes in wrong position: If the brushes are left in the same position as when the machine is received, trouble will not occur from this cause. If brushes are ever moved or changed, see that they are put back where they belong, and that marks on brush yoke and bearing housing agree.
Machine makes excessive noise: This is most often due to a weak floor, or to the machine not setting firm and level. If the noise seems to be in the machine itself, and nothing can be observed out of place, send for an electrician, as the trouble may be serious.
Bearings run hot: See General Instruction No. 10.
TO SECURE THE BEST RESULTS
(1) Keep the machine clean.
(2) Keep the oil wells full (not overflowing) of good clean lubricating oil.
(3) Keep the commutator and brushes free from gum and grease.
(4) Keep contacts clean and tight.
(5) Keep lamp and wiring free from grounds.
(6) Keep the current at the arc within the rating of the machine.
When repair parts are needed it is poor economy to try to get along without them. Brushes and bearings for these machines can be shipped on short notice and will always be of correct size and quality. In ordering from the manufacturer simply give the nameplate marking, serial number, etc., and no difficulty will be experienced in promptly securing the desired parts.