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FOR MANAGERS AND OPERATORS llS Machines. THE EDENGRAPH. The Edengraph machine is new to the projection frater- nity, therefore it is in order to give detailed instruction. The gears are incased in a dustproof casing, the back side of which is a plate of metal sliding in grooves which lifts out, disclosing the entire gearing of the machine. To set the shutter remove the gear cover plate and you will see, just over the fly-wheel, a thumbscrew on the end of a universal joint shaft. Loosen this thumbscrew and you may turn the shut- ter at will. Now turn the fly-wheel in the direction it nor- mally runs until the intermittent sprocket is just ready to move. Hold fly-wheel stationary and revolve shutter until it covers all but about one-quarter of an inch of the lower part of the aperture opening. Now hold the shutter (not the fly-wheel) stationery with one hand while you tighten the thumbscrew on end of universal joint shaft with the other, and the job is done. You will notice the frame-up carriage is counterbalanced by a spring held by a rod which terminates in a large, dark- colored, smooth screw on top of machine, near right front corner. Look at this arrangement carefully and you will see how it works. But the mere adjustment of this counter- balance is not always sufficient. Should the frame-up car- riage be too loose and work up or down as the machine runs, you may tighten it by first loosening the three large screws in upright bar which forms one angle of front, right corner of machine. Next tighten (or if frame-up works too hard, loosen) the four small screws which are seen up and down near edge of machine at front, right-hand corner. Adjust these screws so that carriage works just right and then re-tighten the three screws you loosened first. The sprocket idlers must be so adjusted (you can easily see how it is done) that they will set away from the sprockets by about twice the thickness of an ordinary film. The automatic