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MANAGERS AND PROJECTIONISTS 539
double pole knife switch, and through fuses of about five ampere capacity.
With generator B running normally, close the switch. If the shunt winding of generator A is in good order its field will show considerable magnetism. Generator A is running, of course, at time of test. With both machines running at full speed, reduce the voltage of machine B as much as possible and then open the connecting switch. If the voltage of B cannot be materially reduced, then set the field rheostat of machine A on the contact marked "IN," after which open the connecting switch slowly, gradually lengthening the arc which will be formed at the switch contacts, until it finally breaks.
SHOULD A NEW MACHINE REFUSE TO BUILD UP VOLTAGE, and the connections seem to be alright, reverse the field connections by interchanging the connections of the wrires leading to the generator field coils. They are connected to the positive and negative terminals of the generator. If this has no effect, change the connections back as they were and seek a fault elsewhere, as before directed.
BRUSHES — Always fit brushes to the commutator perfectly, as per General Instruction No. 7, under division (c) of "Sparking." Briefly this is to lift the brush, place a strip of No. y2 sandpaper under it, under tension, sand side toward the brush, and draw it in the direction of armature rotation. Continue this until brush fits curve of commutator perfectly. After drawing the paper under the brush under its tension pressure, remove tension pressure and draw paper back. When you have finished grinding one brush, release the tension on it while you grind the rest of them. IF BRUSHES ARE COPPER PLATED, bevel their edges enough so that the copper does not come into contact with the commutator.
INSPECT THE BRUSHES frequently for (A) Brushes sticking in holders. (B) Tension readjustment as brush wears away. (C) Worn out brushes replaced before their contact with commutator is affected, or destroyed entirely. (D) That pig-tails are properly attached to brushes and holder. (E) That copper plating on brushes does NOT make contact with commutator bars. Keep brush edges beveled to prevent this. (F) EXAMINE CONTACT FACE OF ALL BRUSHES once a week and see that any copper adhereing to face of brush is removed, and that brush face is in good condition.
COMMUTATOR CODE— See General Instruction No. 7.