Business screen magazine (1940)

Victor's New Arc Projector ♦ A new Victor product — the Model "E" High Intensity Arc Lamp Projector — has just been announced by Victor Animatograph Corporation of Davenport. Iowa. This model was especially designed by Victor engineers for heavy-duty service and to fulfill a demand for a projector that will produce ultra AN OPEN LETTER TO YOUR BUYER Dear Sir: The audio-visual method of training has been recognized as the most effective. Audio-visual equipment produced by Radiad Service has been proven to be the more effective way of using this most effective medium. You will appreciate the story of our latest developments, and we will be happy to furnish you with full details. Won't you drop us a line, and let us show you how we have answered a 1001 equipment problems. Just send your card or letter to us at 154 E. ERIE ST. • CHICAGO Designers and Builders of Quality SOUND SLIDEFILM EQUIPMENTPLAY BAG K -TRANSCRI PTION and AMPLIFIER UNITS RADIA'D brilliance of screen images in large auditoriums and outdoor areas. In its construction \ iclor has retained the fine features that have so universally popularized the company's projectors in the past. The complete unit consists of a projector, sound unit, amplifier, speakers (21, arc lamp, rectifier and projector stand. Literature containing complete specifications and features of this new projector is now available. Request Form No. 1052. Address Victor Animatograph Corporation. Davenport, la. ♦ Simplification of the teclini(]ue of color cartoon production has been achieved by Hollywood Colorfilm Corporation with the recent installation of two new machines. First of the new units, a 35mm printer, is designed for the purpose of making cartoons in either two or three colors, shot originally in either bipack or three-color on 35 mm. stock. The second unit, eliminating the need for a cartoon stand, permits cartoons to be shot in Kodachrome and blown up to 35mm. Protecting Your Valuable Films by Treatment ©Every sales or teaching film carries a message. That message must be put across effectively, or the film is a waste of money. Distraction from the message must be avoided. One of the most important causes of a break in concentration and lack of attention is a scratchy and stained film. This can and should be prevented. A good example of the importance of providing an effective protection to the film is the specification provided in the print bid for the vocational training film program now being produced by the United States Office of Education. "All prints must be subjected to a permanent conditioning and protective treatment, equal to the J'aporate process, resulting in a reaction directly on the emulsion itself. Such treatment shall raise the melting point of the emulsion in ivater and cause no loss in pliability. Such conditioning shall be effective within 2-1 hours after print is developed and dried. The type of treatment that forms a skin-tike layer or varnish on the surface of the film will not be accepted." To many film users the most novel and striking feature of this provision for adequate film protection is its inclusion in the specifications. The fact that protective treatment is recognized as an essential element of an acceptable print, as vital as good planning, good production and good printing is signified. The thought that an unprotected good print is as undesirable as a bad print may be new to some, but it is important to all. Careful analysis of the specification casts light on the causes of film damage, and on the best preventative measures. It should be noted, first, that the protection demanded consists of changes in the physical properties of the emulsion. The celluloid base of standard first quality film is accepted as sufficiently durable in itself, without added protection. Similarly, the stability of the silver image presents no problem after proper handling in the laboratory. Film damage is con AMPRO'S TRI-PURPOSE PUBLIC ADDRESS SYSTEM, constantly improved over a period of years by new and designed circuits, is now playing a useful role in industry where educational meetings for defense workers are conducted; in school auditoriums and similar meeting places such equipment is indispensible. Shown above is latest PA-3 Model Amplifier which has a power output of over 55 Watts lined largeK to the gelatin in the emulsion. .Scralches result when the gelatin is too soft to resist abrasion. Oil .stains, dirt spots and fingermarks are absorbed inio the emulsion when the gelatin is too soft to exclude them. Damp heat tends further to soften unprotected gelatin. Therefore, the specification requires a hardening of the gelatin evidenced by the raising of the melting point of the emulsion in water. This purpose, alone, could be accomplished by any one of several well-known liquid gelatin hardeners. These all function by reducing the water content of the colloidial molecules. Gelatin too low in water content tends toward brittleness. The specification therefore excludes this dangerous expedient by requiring that the protective treatment cause no loss of pliability. Surface lubrication on film provides temporary protection against scratches. This lasts, however, only until the lubricant is rubbed off in use or washed off in cleaning. Lubricants provide little protection against climatic damage, and none against staining. The specification requires that the conditioning protective treatment be permanent and that it result in a reaction directly on the emulsion itself. Theoretically, a lacquer over the emulsion would exclude stains and protect the gelatin against any scratches not so deep that they penetrate through the lacquer. Theoretically again, worn, stained and scratched lacquer could be removed, and fresh lacquer substituted. Practically, a full surface lacquer would have to have a coefficient of expansion identical with both celluloid and emulsion. Partial, or highspot lacquers can expand safely under heat, but do not protect the entire emulsion against the various types of damage. The specification provides that the type of treatment that forms a skin-like layer or varnish on the surface of the film will not be accepted. The "Vaporate" process, set up in the specification as the standard of adequacy, consists of subjecting the film to the effects of a successive series of vaporized chemical reagents in a vacuum chamber. Vaporate meets the specification by first substituting lasting internal lubrication for the normal water content of the gelatin, to assure a fully maintained pliability reserve. .A second chemical vajior toughens the gelatin solids and renders the colloids insoluble, raising the melting point of the emulsion in water, and affording protection against damage from climate, abrasion and defacement. These are chemical re 28 BuMinvftx SiTVfin