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568 MOTION PICTURE PROJECTION
trap in position and the film door open. It will be noted also that the outer radius of the intermittent sprocket is directly in line with the outer surface of the film trap shoe, which position is the one called for in a perfect alignment. To determine whether the film trap is lined up accurately, place the edge of a 6" steel rule or scale upon the film trap shoe S-309-E, P. 5, in such a manner that the lower edge of the scale projects beyond the shoe and rests on the outer radius of the intermittent sprocket directly under the film trap shoe. This test should be made when the intermittent sprocket is at a point where in framing it does not carry toward the screen but is carried by the eccentric toward the lamphouse. If the trap is in proper position, there is absolutely no space discernible between the edges of the steel rule and the film shoe. If, however, there is even the slightest space apparent, it means that the film trap is out of line, and can be brought into alignment by slightly loosening the film trap screws S-133-C, P.4, and tapping the film trap either on the top or bottom until properly squared or lined up. This alignment once acquired, it is only necessary to tighten the film trap screws securely and replace all mechanism parts by reversing the order of instructions given above.
TO REMOVE FILM TRAP STUD
After following the instructions above, it is now possible to remove the film trap stud, which is connected to mechanism by film trap stud screw S-134-E, P.2, and which stud also carries film trap door holder.