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33G MOTION PICTURE HANDBOOK
Having scraped the ends clean as directed, place them together so that the sprocket holes exactly match (if patch is to be made with fingers), with the emulsion side of both ends either up or down — that is to say, on the same side. Grasp one edge firmly with thumb and finger and apply cement, with the cement bottle brush, to the other. Clamp the cemented edge down tightly, being careful the sprocket holes exactly match, with thumb and finger of other hand, releasing opposite edge. Apply cement to other edge and clamp that also, applying all the pressure you can for about five seconds or so, and the patch is done. Every cement bottle should have a small brush attached to the under side of its cork. When you buy cement accept none without the brush. It is put up that way now by many, and should be by all.
Film Cement may be easily made. There are many formulas, but the following is perhaps as good as any for both inflammable and non-inflammable stock; y2 pound of acetic ether, *4 pound of acetone merch, in which dissolve six feet of non-inflammable film from which the emulsion has been removed.
For inflammable film, a piece of film three inches long dissolved in one ounce of acetic ether is a satisfactory cement, but it will not work on N. I. (non-inflammable) stock. In dissolving the film, in either case, first remove the emulsion and then cut the film in fine strips.
Emulsion May Be Removed Entirely From Film by soaking it in warm water, to which ordinary washing soda has been added. Put in plenty of soda. ' Wash the film afterwards in clean, warm water.
Moistening Dry Film.— Traveling exhibitors often find that a reel which has been a long time in use has become very dry and brittle. It may be re-moistened and rendered pliable by unwinding into a large, metal can, in the bottom of which water has been placed, with a wire screen over it to keep the film from contact therewith. Cover tightly, set in a moderately warm place until the film is soft and pliable. Watch closely, however, since if made too moist the emulsion will stick to the back of the film when it is rewound.
It is even possible to give a film a glycerine bath, as follows : In a long, shallow pan place a solution of 30 parts of clear water to one part of glycerine. Make a drum of two barrel heads and slats. Attach the reel containing the film to one end of the pan and by revolving the drum draw the film very slowly through the liquid, winding on the drum with the emulsion side out. After the film is all on the drum, revolve it rapidly to throw off the surplus liquid, then continue to revolve the drum slowly un