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MANAGERS AND PROJECTIONISTS 701
shaft of the motor directly with the friction driving shaft R-25. If you don't do this, there will be trouble and probably more or less noise. In fact, should the device develop noise at any time, and you find that the friction wheel material is true, the next thing to look at is the alignment of these two shafts ; it being possible that bolts R-8 worked loose and let the motor get out of alignment with the driving shaft R-25.
INSTRUCTION NO. 7— NO OIL.— With the exception of the motor bearings, none of the other bearings of this device require any lubrication whatever, this by reason of the fact that the bushings are all of material which requires no lubricaton.
THE POWER'S ADJUSTABLE SHUTTER BRACKET.— This is a very simple device by means of which the revolving shutter may be "set" or "timed," within certain limits, while the projector is running. It is illustrated in Fig. 249. The main advantage this device presents from the viewpoint of the projectionist, is that it is only necessary to set or time his shutter approximately correctly in the usual way, since he can make the finer adjustment by means of knob A after the projector is working. Instructions No. 28 and 32 contain matter concerning this bracket.
POWER'S FRICTION TYPE, GOVERNOR-CONTROLLED SPEED CONTROL.— This type of speed control is illustrated, as a detached unit, in Fig. 250. It is shown attached to the projector in Fig. 231. Its internal mechanism may be examined in Fig. 251. Fig. 250 is very largely self-explanatory.
Examining Fig. 251, shaft M has a collar, P and Q, on either end, and runs in bearings N and U. All parts between pulley A and part B, including ball bearings F, G and O, are mounted upon but are in nowise attached to shaft M. By this we mean that they simply use shaft M as a spindle upon which to revolve.
The action is as follows: The driving motor is attached directly to pulley A, Fig. 251, by means of an endless, flat, half-inch belt, as shown in Fig. 250. This pulley and part L form one part and revolve as a unit, part L being faced with a disc of friction material attached thereto by screws.
Part B is a fork which connects directly with and is controlled by knob H, Fig. 231. Ball bearings F, G ana O act entirely as thrust bearings. They are not bearings within the ordinary meaning of the term. Their office is to carry the end thrust, which is the basic principle upon which the control operates.