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MOTION PICTURE HANDBOOK
Commutator
Direction of Rotation Plate 11, Figure 188.
way they must be carefully reset so that they may make proper angle with the commutator, as shown in Plate 11. They must also be so placed around the commutator that the distance from tip to tip of the brushes is exactly the same when measured both ways around the commutator.
See Fig. 180, Page 375. Care should be taken that the brush holder be securely fastened at an even height, one-sixteenth of an inch above the commutator. It is recommended that an extra set of brushes be kept on hand. Brushes may be worn down to approximately three-quarters of an inch in length. Only brushes of the proper grade will give satisfactory results, therefore only the brush furnished with the machine or others exactly the same grade should be used.
Loose Connections. — See "General Instruction" No. 6. Loose Connections. — See "General Instruction" No. 6. Trouble. — All compensarcs are carefully inspected at the factory and tested on a projection arc lamp under actual operating conditions, as nearly as they can be secured in a factory, therefore when the machine is received by the operator it is ready to set up and run. If trouble is experienced do not blame the machine until you are certain it does not lie in some part of the equipment or in some local condition.
Ordering Repairs. — If it is at any time necessary to order repair parts, such as new brushes, new bearings, etc., bear carefully in mind the fact that the serial number and name plate readings of the machine must be placed on the order.
D. C. Compensarcs. — Machine will not start: If the machine does not start first examine the fuses and make sure that the power is on at the switch terminals. Then trace and inspect the connections from the switch through the starting box, armature, brushes, field and back to the switch, and an opening in the circuit will probably be found.
Fuses Blow: If the fuses blow make sure they are of proper size for the amperage used, and not loose in their contacts. Examine the starting box for grounded or short circuited resistance coils. Look inside the machine and see that the connections are not touching inside where they are