Richardson's handbook of projection (1930)

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1008 HANDBOOK OF PROJECTION FOR n n nLifi n n~7iT?, SOUND FILM SPLICE.— The procedure for all sound film splicing is the same. The "variable area" and "variable density" sound films splice requires exactly the same procedure. First make a good* strong splice, using only approved cement which, when used properly, will neither curl nor stiffen the film. Then a sort of broadbase triangle must be painted upon the sound track, using a black lacquer for the purpose. Do not use ink or similar supposedto -be opaque liquids. They will not do at all. "Zapon Concentrated Black Lacquer, No. 2002-2," made by the Zapon Company, The Canal, Stamford, Connecticut (that address will reach them if your dealer does not carry the lacquer), is recommended by the producers of sound film and equipment for the purpose. It will be well when ordering Zapon to at the same time order some Zapon thinner, No. 20, as Zapon lacquer is very quick drying, hence is volatile and will evaporate rapidly when exposed to the air. It should be kept tightly corked. The method of placing the triangle is illustrated in Fig. 386. You are again warned against attempting to substitute ink, et cetera, for the proper lacquer. It won't work. B llllllllllllllllllllilllllll Figure 386. A — Correct splice, quiet. B — Too 6hort, will click. C — Too long, keeps sound off. If the lacquer be not placed on the splice, or if an improper liquid be used instead of the lacquer, there will be a more or less sharp click as the splice passes the