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MANAGERS AND PROJECTIONISTS
495
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on this sandpaper under the pressure of its tension spring, and revolve the armature by hand, or by pulling a long piece of heavy cord bound around the commutator one or two times, until the brush is ground down to a proper bearing. It is also possible to lay a piece of sandpaper on the commutator and pull it back and forth, but the other way is the better. Do not apply power to the motor for grinding brushes.
NO. 16.— HEATING.— (See General Instruction No. 11. )
NO. 17.— GENERAL REMARKS.— Plate 3 shows the construction of the brushholder in detail, 14 being the pig tail, 11 the spring which governs the amount of tension supplied the brushes through finger 9, P. 3. Plate 4 shows the pole piece construction, main poles A-A being wound and B-B not wound. In like manner interpoles or "commutating poles" C-C are wound, while D-D shows the core of the poles without the windings. The machine is entirely self-contained, and requires no special base. It may either be set on a cement floor and bo Ited down or on any other reasonably solid
foundation, but if installed in the projection room it should be set on a small rubber pad or heels of good live rubber. This will take up all vibration, make the machine practically noiseless, and there will be no necessity for bolting it down at all.
The efficiency of the machine is claimed by the manufacturer to be between 65 and 70 per cent., depending upon local conditions and the degree of intelligent care given.
The accompanying connection diagrams are quite plain,
Plate 3, Figure 169.