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FOR MANAGERS AND OPERATORS 467
teeth at the lower end will be obliged to do all the work of pulling down the film until such time as they have worn off sufficiently to bring the teeth on the other end into play, whereupon, if the shaft then be lined, the opposite condition will obtain, and the teeth on the other end will be doing all the work. This would be very hard on both the film and the sprocket. The method of aligning these two shafts will vary with different machines, and must be left largely to the judgment and ingenuity of the operator. In all machines in which the intermittent sprocket shaft has a bearing at either end the adjustment is made by means of two eccentric bushings, and there is always the liability, when making an adjustment for the purpose of eliminating lost motion in the intermittent, to turn one bushing more than the other, thus getting the sprocket and shaft out of level with the cam shaft. In some machines the distance between the two shafts at either end may be tested with a caliper. With other machines, however, this test is of no value, since the diameter of one or both the shafts is smaller at one end than the other. The competent operator, however, will certainly be able to devise some effective method of testing this matter, and he should by all means do so, since it is of the greatest importance.
General Instruction No. 14. — On the old type machines it is very important indeed that the magazines be accurately lined with the machine. With the newer projectors this is taken care of at the factory, and the magazines can only be placed in one position, therefore cannot possibly be out of line. The film in passing out of the upper magazine and into the lower magazine must travel through the fire trap, and if the magazine is out of line with the machine the film is likely to rub against the side of the trap and in time cut the metal in two, thus ruining the fire trap; also if the upper magazine of the old style machine is much out of line it is also quite possible the film will not come down squarely to the upper sprocket, and this is likely to make trouble. If it be the lower magazine that is much out of line then the take-up will pull the film sidewise and there will be added tendency to lose the lower loop. The film should pass from the upper and into the lower magazine without touching either side of the trap.
General Instruction No. 15. — It is a most excellent scheme to have operating room reels and only use the exchange reels, which are very apt to be in more or less bad condition, in the upper magazine for the first run, placing one of the