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84 The Audio-Visual Handbook
does mean that in cases where outline slides are to be used or slides which have extreme contrasts of black and white, they may be used in rooms which have been darkened only partially. It means that in those cases where the school architect failed to provide suitable shades for darkening the room, a limited amount of projected materials may be used with varying degrees of success. The teacher or administrator who is interested in purchasing equipment should not be fooled, however, by the various representations of daylight projection either with glass-slide projectors, motion-picture projectors, or any other type of instrument which is expected to provide a clear image.
The Filmslide
The filmslide, which has been in use for the past twenty years, is another type of projected still picture. It differs from glass slides as the pictures are printed in series on 35 mm. film. The film pictures, therefore, are reduced to about %" x 1", or 1" to 1%" in size, and their cost, weight, and storage space are reduced correspondingly. Although the slides are in fixed series, a slight projector adjustment makes it possible to show the pictures in any order which may be desired. Also, the individual pictures may be cut apart and mounted between 2" x 2" cover glasses.
The filmslide is called by various names which should be mentioned here to avoid confusion. "Filmstrip" is a name used in some places. Here and there the nomenclature is reversed, and we may hear "slidefilm" or "stripfilm." They are known to some as "film rolls," and as "stereopticon films." The trade name adopted for them by a leading producer is "Picturol," and "filmslide" is the name used by many of the educational producers; but these names all refer to the same convenient series of pictures, as illustrated here. Filmslides were introduced by the Society for Visual Education, Inc., in 1920. Their use has spread extensively, not only among schools and churches, but also in the industrial field, among CCC camps, and in many other Government agencies. Their place in defense training is highly important.
There are two common sizes of the filmslide: the single-frame slide and the double-frame slide. The single-frame slide, which is in more common use, was described partially in the first paragraph. The width of the picture is across the film, the top of the picture on each frame or "slide" being toward the head of the film, so the filmslide runs through the projector vertically. The double-frame slide is about IV2" x 1" m size5 but is printed on the same width of film — 35 mm. —