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FOR MANAGERS AND OPERATORS 197
of a safety razor. Be sure to thoroughly scrape end B and to scrape every particle of the emulsion off stub end, A. Cement will not stick to emulsion. You must remember that the emulsion covers the entire film on one side, therefore be careful to get it all off around the sprocket holes. This is where many make their error in patching film. They scrape the center of the stub and the center of the back of end B, but do not scrape thoroughly around the sprocket holes, where the greatest strain will come. In consequence their patches soon come loose around the sprocket holes and there is trouble. The stub should be scraped to a straight line, as per dotted line, else there will be a flash of white light on the screen as the patch passes. It matters little whether patches be made as per C, or D, Fig. 75. Patches made one way will go through some projectors better when partly loose, and through other projectors loose patches will go through if made the other way. If the patch is in good' condition it will go through equally well either way it is made. 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 cement 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 ten 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. The following are a few formulas: For non-inflammable stock, one-half pound of acetic ether, one-quarter 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 into fine .strips.