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98 The Audio-Visual Handbook
audience. The surface of the projection screen for three dimensional pictures is of a special metallic type, similar to the aluminum screen, and may be used equally well for other types of projection.
Since the experience of depth in images produced by the stereo projector is so lifelike and effective, it is expected that equipment of this kind will, in the future, be adopted by the more advanced schools. At the present time there is no adequate source of prepared filmstrips and slides to be used in this projector, but many of those desiring to have such effective teaching material are producing it inexpensively for their own slide libraries.
Slide Binders
For the many schools developing their own miniature and stereo slide libraries, there are available binders of simple design which will protect films from damage due to mishandling. Kodachrome emulsion is, of course, subject to scratches, abrasions, and fingerprinting; and dust over the surface of these color films will detract from their excellence in the projected image. Kodachrome film should, therefore, be mounted in one of the efficient mountings which are now available for single and double frame, bantam, and stereo films.
Standard binders are available for both the bantam and double frame sizes; for the mounting of single-frame film there is a special mat which is designed to fit inside of the the double-frame binder, which reduces the aperture to single-frame size. The binders are reasonably priced and will keep the Kodachrome film cooler during projection. These binders are very light in weight; exceptionally easy to use in the mounting of film. The film is held tightly between glass, thus eliminating warping and the annoyance of refocusing
The Silent Motion Picture
History of the Motion Picture. The thing we call a motion picture, which is not a picture of motion at all, has been in existence for countless ages. That is, the principle of the motion picture has been known to mankind for three or four thousand years. Historical records indicate that in ancient China there were devices which produced the effect of motion perceptible to the eye. One of these devices has been explained as being a dark box in one end of which was a small peephole and in the other end a hole about three inches square. Some enterprising Chinese with artistic ability had painted similar