Motion Picture Herald (Oct-Dec 1952)

very drastic and I do not recommend its practice except in extreme cases. Acetate film may be distinguished from nitrate film by a burning test. Cut a frame from the film, take it outside the theatre, and apply a match or a lighted cigarette to it. Nitrate film will burn fiercely; acetate film will burn or smoulder very slowly. It is important to repeat that whenever there is a doubt about any of the film in a theatre. All of the film should be handled and stored just as if it were all nitrate film. Regardless of the type of film base used, the steps that follow in the manufacture of a theatre print are fairly standard procedure. The clear film base is first given a very thin coating of clear gelatine to serve pleted, each reel is projection-tested for visual defects and is then ready to receive lubrication in the waxing machines. The purpose of lubrication is to minimize damage caused by the sticking of new prints during the first few projections in the highintensity, high-temperature carbon arcs. New or “green” prints may still contain sufficient moisture to cause the emulsion to remain soft and unstable and possibly rub off on the aperture gate, slides and runners. Sticking is evidenced by a wild chattering of the film, and when severe it may cause a jumpy picture and sprocket hole deformation. In one method of lubrication, a thin coating of wax is applied to the outer borders EMULSION BINDER FILM BASE NITRATE OR ACETATE FIGURE 5 — Enlarged section of double emulsion film. EMULSION FIGURE 4 — Enlarged section of standard film showing component layers. as a binder between the film base and tbe emulsion. This binder insures a perfect bond between the photographic emulsion and the film base. Next, the photographic emulsion is applied to the coated film. This emulsion may be in a single layer for black-and-white, or may be in two or three layers for colored film. In the case of duplitized colored film one layer of emulsion is applied to either side of the film. Figures 4 and 5 show enlarged sections of film with exaggerated views of the multiple layers of materials which are combined in a theatre film. After the emulsion has been applied, tbe film is cut in ribbons 35mm wide and is perforated. These steps are now done at the factory because of the extremely high precision machinery required. The film is now sent to the studios. When printing, developing, drying and processing are com Analyzing 1952 for ( Continued fr lines and electrical outlets to provide for the installation of such automatic equipment. In anticipation of reopening — a date that comes around very rapidly — nothing should be left until the last minute. Among the many details vital to good drive-in operation that can be checked and prepared for the opening are the painting of picnic tables and park benches ; ordering and replacement of worn parts for in-car heaters ; painting and replacement of directional of film on the emulsion side. A second method involves the application of a very dilute solution of wax and carbon tetrachloride to the entire emulsion area of the film. A third method coats the entire film with an extremely thin layer of special lacquer. This last method, although it is more expensive, is now gaining favor in the trade because it may eliminate first-run damage to film, reduce shrinkage and brittleness, and offer a protective coating which gives much longer projection life to any release print. The last few years have produced great improvements in the materials and techniques going into the making of motion picture release prints. Certainly these advances have served to increase the life of the film ; but more, they have improved the safety of theatre personnel and audiences. Operation in 1953 om page 22) signs; and replacing burnt out lights. Other matters are checking of grounds cleaning equipment and lawn mowers; ordering of plants and shrubs to be planted at a later date ; checking and ordering of lighting fixtures for better and safer traffic direction. Check inventory of insect chemicals, and order them if needed. Check car-hop vending equipment for repairs and painting. Replace burnt out lamps on each post used in ramp lighting; check highway safety RICHARDSON'S BLUEBOOK of PROJECTION SEVENTH EDITION For over three decades, through edition after edition, this celebrated work has grown with the technics of the screen art. Today it is known among projectionists throughout America and much of the rest of the world as the projectionist's standard textbook. Now in the current Seventh Edition this standard textbook on motion picture projection and sound reproduction brings up-to-the-minute guidance. Contents include four chapters on Theatre Television, prepared for the practical instruction of motion picture projectionists, and a chapter on control track and stereophonic reproduction. Order from $■7.25 # Postpaid QUIGLEY BOOKSHOP 1270 Sixth Ave., New York 20, N, Y. ^IGGS EQUIPIUE^T C Belton, Texas ADLER CHANGEABLE LETTER DISPLAYS ADLER CLASS-IN-FRAME DISPLAYS— “REMOVA-PANEL” — “THIRD DIMENSION ” PLASTIC & CAST ALUMINUM LETTERS ADLER “SECTIONAD” LOW COST CHANGEABLE LETTER DISPLAYS WRITE FOR FREE CATALOG Adler Silhouette Letter Co. 3021 b W. 36th ST., CHICAGO 32. ILL. BETTER THEATRES SECTION 41