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MOTION PICTURE PROJECTION 485
Fig. 184, better than could be described in a few words. The illustration amplifies the description for placing the speed control on the machine.
It may be advisable, however, to give a few details in connection with the operation of the device.
The variable speed control is operated or controlled by Handle S-438-M (page 523). By turning this handle either to the left or right, the movement of it either tightens or releases the Tension Spring F-119-X and moves the friction disc S-218-L. This friction disc S-218-L operates between the two other discs X-7 and D-118-X. At any time, it is only the rim of the friction disc S-218-L that comes in contact with the other discs X-7 and D-118-X. When the handle is turned so that the contact of the friction disc is near the center of the other discs, the speed is low because the contact is almost at the center of the circle of the two discs and revolves on a small circumference. As the friction disc S-218-L is moved out near the edge of X-7 and D-118-X the circumference of the circle increases, and the speed is correspondingly increased.
It is absolutely necessary, if the friction disc S-218-L is to drive the control and the mechanism, that it have a friction contact.
No oil of any description can be used on the friction discs or the other discs. And, further, as oil may accumulate on these discs from time to time from the shaft, the discs must be wiped off occasionally. As soon as the oil accumulates, friction is eliminated, the speed reduced and the device may stop entirely. A small amount of vase