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248 AMATEUR MOVIE MAKING
The selected film is removed from the humidor, the film clip removed and the reel placed upon the projector. Have all reels marked, stating whether the film is an original reversed film or a printed positive or reversal duplicate. The reversed films (originals) are threaded through the projector with the individual images upside down and the polished side of the film toward the light. The printed positives and reversal duplicates are threaded upside down but with the dull side of the film toward the light. The light referred to is the. projector light. The opposite side of the film will then be facing the projection lens.
In most cases this means that the side of the film which faces the lens will be wound upon the outside of the reel. This point should receive careful attention as otherwise the pictures will be reversed from right to left.
This reel is placed upon the projector and about eighteen inches of the "leader" pulled from the reel. This is threaded according to the manufacturer's directions. When the last sprocket or the lower side of the master sprocket is threaded, there should be a sufficient length of the leader left to be attached to the take-up reel. This is done by slipping the end of the film into the slot cut in the hub of the reel. This is at best an awkward job, and often consumes as much time as the rest of the threading together. This tedious operation is rendered unnecessary by using the ACH self threading reel. In place of a slot in the reel hub, there is a small plate of spring steel. This plate bears two prongs upon each end. The film is dropped between the film flanges and pressed against the hub with a finger thrust through one of the openings in the reel flange. The reel is then turned around. The prongs catch the perforations and carry the end of the film around the hub. As the plate is double ended, the film will be caught regardless of the direction of revolution of the reel. It may be remarked that these reels are notched at the factory for use with the ACH film clips.
When the projector is threaded, glance at the film to see that both sprocket engagements are properly made and that the loops are of the right size. If everything is properly set, start the projector. If all of the preliminary