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24 HOW TO USE THE EDUCATIONAL SOUND FILM C. THE USE OF THE SOUND FILM TO ENRICH OR EXTEND A UNIT The previous discussion of methods and purposes has been concerned largely with the use of films which are basic to the unit of instruction which is being studied. However, some- times there may be no basic film available, and a film dealing with only one section of the unit, or with ideas related to one section, may be employed. Again, the teacher may wish to extend the contribution of the basic film by utilizing another talking picture which goes beyond the content outlined for the unit. The teacher sensitive to evolving interests can make good use of films which highlight areas tangent to the unit as originally planned. This use of the sound film is especially significant in meeting the needs of pupils of superior ability who can quickly master the essentials of the unit and thus have time to pursue their special interests. Still another pos- sibility explored by teachers is that of employing a specific subject-matter film in a different course, for motivation or illustration. An interesting example of this varied use of the sound film is presented by music teachers' showing of the film Sound Waves and Their Sources, designed primarily for physics classes. In one high school the music teacher employed this film to present the concepts of sound and tone, and to give pupils a clear idea of the construction of the human throat. The fact that the sequences in the film which served these two purposes constituted only a small part of the total foot- age presented no difficulty as long as the pupils understood the specific purpose of the showing and had had their atten- tion called to the materials they were to study in the film. One of the most frequent applications of the film to a differ- ent subject-matter course is that in which a science film is used in an English class as motivation for oral and written composition. In a rural school in which special stress was being laid upon written composition, the films were used to stimulate this type of activity: