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MOTION PICTURE PROJECTION FILM MENDING CEMENT Care must be taken not to dirty the film in the handling. Scraps of film should be kept, if the operator proposes to make his own film cement. The films must be cleaned of the emulsion or gelatine by treatment with water, warm if necessary, and rubbing. The film in quantity enough to make a thick solution is dissolved in the following solvent: Amyl Acetate 1 part by measure Acetone 2 parts by measure The best plan in most instances is probably to buy the cement ready made. The above is for the ordinary celluloid films; for non-inflammable films a special cement has to be used. FILM BREAKING DURING THE PROJECTION If a film breaks during an exhibit inn, it may be temporarily joined by a wire paper clip, or enough may be drawn down to the lower magazine to get a turn or two around the film on the reel. The ends may even be pinned together. Do not forget to remove the clip or pin and to join the ends with cement. FILM MENDING MACHI A machine or press for mending films is shown in the illustra- tion. A flat surface adapted to receive the film has pins pro- jecting upwards from it. The-e pin- are so spaced as to exactly correspond to the >procket holes in the film. When the film is cut off square and prepared for cementing as described, it is placed in position with the pins passing through the sprocket The hinged upper part is then brought down on the film, and the special press is applied to the cemented ends. By the use of this machine absolute accuracy is secured, and no time is wasted in fitting the parts together and in ensuring the line-up of the two parts being united. A screw is provided, seen on the right of the machine to adjust the position of the pieces of the film and to ensure matching of the holes. As a guide or safeguard a short piece of film could be used with this screw to obtain a perfect spacing of the per- forations. It is obvious that it is a great advance on doing the cementing by hand. 256