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Selling Within the Theatre 151
announcements, film trailers instead of slides are often used. This means extra expense. Often the slide for a small announcement would be steadier and more effective than a trailer. Besides, there are emergencies when a slide must be used because there is not sufficient time to send copy to a trailer manufacturer. Therefore, the theatre should be equipped with the necessary material for making slides.
Scratch Slides. — Every house should keep in the projection room half a dozen scratch slides for emergency use. A scratch slide can be written on as rapidly as a message can be written on paper with a pencil. The scratch slide is merely a glass plate coated with some opaque substance which may be scratched through, to get a white letter on a dark ground. The glass is thinly coated with photographic "marl" or "opaque," with whiting or Bon Ami in powder form, care being taken not to get the coating too thick. If the coat is too thick it will cake and come off in flakes, and fine lines are impossible. These scratch slides should be kept handy in the projection room, with some sharp-pointed stylus, preferably a "scriber" which can be obtained at any hardware store. The message is scratched, a cover glass added, a bit of tape used to bind the two glasses and the message is ready for the screen.
Radio Mat Slide. — For a more careful preparation, where time permits, the Radio Mat slide is suggested. This consists of sheets of gelatin the size of the slide, backed front and back with carbon paper. There is a protecting cover. The entire pack is placed in the typewriter, the message written precisely as in the case of any typewriting, but using a firm touch, and the carbon marks are transferred to both front and back of the gelatin, making a neat and solid letter. A mat is provided to outline the shape. The mat and gelatin, with the carbon paper removed, is placed between two thin cover glasses.
For permanent use, the slide is bound on all four sides with a strip of gummed paper. For temporary use, it is sufficient to have the long side of the glass hinged with this binder, using just a bit of the binder on the other side, to hold it down.
Home-Made Slides.— Radio slides are sold so cheaply and are so convenient that it scarcely pays to "roll your own." But home-made substitute slides can be prepared with any sheet 11