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MANAGERS AND PROJECTION IS I S
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electrical contact with contacts 1, 2, 3, 4 and 5. This spring should have the attention of the projectionist occasionally, since it is subject to some heat and the tendency of the contact is to weaken. Its pressure may be increased by bending the spring. It is important that the face of the spring and the face of the contacts be kept smooth and perfectly clean, by occasionally polishing with No. 00 sandpaper.
DISASSEMBLING WIRE COIL RHEOSTATS.— While mechanical methods may differ, the general method of insulation and the principle involved is clearly shown in Fig. 140. The upper and lower ends of coils a, b, c, d, etc., Fig. 131, are joined together, and by the same means are bound to the supporting frame, as shown in Fig. 140. To release any one coil it is only necessary to remove bolt B, which holds its top, and a similar bolt which holds its lower end, but before re-assembling be very sure you have not disturbed the insulation, or if you have, that you have re-established it in perfect condition.
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Figure 142.
CAUTION. — You may find the actual mechanical means employed to join and support the coils, and to insulate them from the frame, to be different from that illustrated in Fig. 140, but be assured it is a mechanical difference only. The actual thing accomplished is precisely the same as that shown, viz. : the coil ends are electrically joined, and in such way that they are bound to and supported by the frame, also