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AMATEUR MOVIE MAKING 255
jection. Then all reels should be securely locked against accidental unwinding by the use of film clips.
Then they are stored away in their humidor cans or in the humidor case. If these precautions are taken after every evening of projection both films and projector will last almost indefinitely.
Every two or three weeks the films should be inspected. During this inspection torn perforation and scratches are searched out as has been explained. The film is wiped with a piece of soft cloth or it is pulled between two small blocks which have been covered with several layers of soft, lintless cloth. This will remove dust and dirt. The pads should be changed frequently to prevent any metallic or other gritty particles from scratching the film during this cleaning.
For this work the cutting rewinds are called into play. The full reel is placed upon the dummy stand and the free end of the film attached to the empty reel upon the geared stand. The film is now slowly rewound, while the edges are allowed to run through the thumb and finger of the left hand. In this way any broken perforations will be felt. At the same time any large scratches or other faults will be seen by looking doAvnward through the film at the cutting light. As long as the film is held between the thumb and finger there is little danger of running too fast for above a certain speed the film will burn and cut the fingers.
When a torn or broken perforation is found the procedure differs according to the type of projector being used. If this projector has a single claw operating upon one edge only of the film, the frame must be removed and a patch made in the film, but if a star-cam sprocket is used for the film drive, the torn perforation is neatly trimmed with a sharp blade or pair of scissors so that it will pass through the mechanism without catching in the gate.
For this film inspection the ACH film inspection outfit will be found to be very satisfactory. This outfit, consisting of rewinds, splicer and magnifier allows each frame to be closely examined as it passes from reel to reel. This is