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Types of Audio-Visual Aids to Instruction
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tures will be as effective as the same material in motion-picture form.
Those who may desire to prepare their own sound filmslides for
regular or experimental use may do so by preparing a series of still
Photo Courtesy The Magnavox Co., Inc.
A Portable Sound Filmslide Projector
pictures on a filmslide and recording the explanatory material on an instantaneous recorder. The record, if recorded at 78 r.p.m., may be reproduced either on a portable recorder or any standard phonograph while the pictures are being projected with a filmslide projector. It is not necessary that both instruments be combined, as shown in the illustration, although the combination instrument is convenient to use.
The Sound Motion Picture
A few years ago, many sound motion pictures were merely silent subjects with subtitles deleted and explanatory sound added. There was then much justifiable controversy concerning the questioned values of such sound. Many believed that the sound treatment actually detracted from potential teaching values of the films, and preferred the silent films with explanatory subtitles.
More recently, the producers of sound films have utilized sound more effectively and silent-film producers have chosen subjects which do not require auxiliary sound. There are now a majority who believe that each type of film has certain distinctive values and should be used in its appropriate place. The natural appeal of sound, however, has