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MANAGERS AND PROJECTIONISTS 703
creased speed until a point is reached where there is just enough left to carry the load at the speed knob A, Fig. 231, is set for, the difference between the speed of discs L and H being accounted for in slippage.
All this is very simple, once you understand it. We therefore recommend that you study the foregoing carefully.
TO DISASSEMBLE THE CONTROL.— All that is necessary to be done when taking the governor type speed control apart is to first let down the cover, which may be done by slipping out the latch holding it in place, and then loosen the set screw in collar P, slip the collar off the shaft and, holding the hand under the entire moving parts of the control, pull the shaft M out to the right, when all the parts will come away in the hand. When reassembling the parts great care should be exercised that they all be placed on the shaft in exactly the same position as before. The covered position of the various parts may be readily seen by referring to Plate 251.
OILING THE CONTROL.— This type of control does not lose its efficiency through oil coming in contact with any of the frictional surfaces, therefore oil may be applied to all parts without fear of making the control inoperative. A medium weight machine oil should be employed to lubricate all moving parts of the control, including the ball thrust bearings.
Particular pains should be taken to see that screw R, Fig. 251, is removed occasionally and oil forced into the oil hole, in order that the lubricant may reach the shaft M at the point upon which parts AL revolved. Also, as often as may be necessary, cup grease should be placed in oil cups S. These oil cups are wick oilers, and only a light grade of cup grease should be used.
POWER'S SPEED INDICATOR.— The Powers Division of the International Projector Corporation has what seems to be a very excellent speed indicator which may be ordered as special equipment for either the Power's or Simplex Projector.
The outfit consists of a small generator driven by belt from the mechanism. This generator generates a feeble current of electricity, the value of the current measured in milli-volts being directly proportional to the speed at which its armature revolves. Connected to the generator is an indicating instrument which is in reality a milli-volt meter but with two