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MANAGERS AND PROJECTIONISTS 723
thick splice to go through without trouble. In figures the adjustment should be such that when the gate or door is closed the cradle shoe will fit the curvature of the sprocket, and so that the shoe will push back about l/64th of an inch away from the sprocket face, which is about the thickness of an ordinary ftusiness card.
The maintenance of this adjustment is of great importance. It is difficult to tell you just how to obtain it, since it must be done by bending the apron. It is largely a matter of knowing just what is needed (which we have told you) and exercising plain common sense.
INSTRUCTION NO. 32. — REMOVING PROJECTION
LENS HOLDER.— Projection lens holder, A-4, P.2, may be removed by taking off the front mechanism casing cover C-159, P.6, and removing screw S-494-A, P.3. The whole tube and sliding block which carries it may then be pulled out.
To adjust lens in holder first loosen clamp screw at front end of top of lens holder. There are several adapters, or bushings which fit inside the holder to reduce its diameter to accommodate various diameter lens tubes. Insert the proper adapter, according to the diameter of your lens tube. Strike the arc, and, without any film in, open the automatic fire shutter and block it open. Project the white light to screen. By means of focusing knob rod R-178-A, P.2, on top of mechanism, set lens holder at center of its travel. Then shove lens tube in or out until edges of light on screen are sharply focused, whereupon tighten clamp screw S-145-A, P.2, on top of lens holder. Final focusing will then, of course, be completed with focusing screw after picture is being projected.
NOTE. — When position of lens in holder has been finally fixed, make a scratch mark on lens tube barrel at front end of holder, so that wh.n you for any cause remove the lens it may be correctly replaced by properly locating the mark.
INSTRUCTION NO. 33.— ADJUSTING UPPER AND LOWER SPROCKET IDLER ROLLERS.— The distance of idler rollers from spocket is determined by the adjustment of screws in idler roller brackets, S-706-C and N-166-C, P.5. See General Instruction No. 12.
INSTRUCTION NO. 34.— TO REMOVE UPPER SPROCKET IDLER BRACKET TENSION SPRING, S-570-C, P.2.—
You may either remove the entire film trap, as per Instruction No. 28, or move the top plate of the mechanism casing