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MANAGERS AND PROJECTIONISTS
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is then forced up over this D. C. armature, and out through openings 23, Plate 1.
Part 1, Plate 2, is the D. C. armature, which is mounted directly above fan 5. Armature coils are fixed in place with retaining band wires where the connections are made to commutator 2, Plate 2. The commutator is made up of hard drawn copper segments, insulated with mica, and held in place with steel rings clamped with four bolts. The D. C. generator is of the four-pole type, and is provided with cornmutating or inter poles.
BRUSHES. — The setting of the brushes is shown in Plate 4. There are four brush studs, 17, Plate 1, and two brushes to a stud. These brushes are attached to the holders by copper "pigtails." Particular care should be exercised to see that the screw holding the pigtail to the brush holder is kept set up tight, because unless the pigtail makes good contact with the holder, the tension spring will be compelled to carry current, which would probably heat the brush spring and destroy its temper.
With regard to the amount of tension the brushes should have see General Instructions No. 7.
The brushes are held in place by a curved arm passing around the holder, ending in a tension finger fitting on the top of the brush. The brushes are held to the commutator against the direction of rotation. The amount of tension can be adjusted by the spring and ratchet on the side of the brush holder.
CARE OF COMMUTATOR.— With regard to the care of the commutator, see General Instruction No. 7.
The A. C. driving motor is the induction type, and is built either for single, two or three phase current, but the same machine will not operate on different phases. All standard machines are built to operate on both 110 and 220 volts.
Plate 4, Figure 180.