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106 HOW TO USE THE EDUCATIONAL SOUND FILM A. Units of a 16-mm. sound-film projector 1. Projector, amplifier, and loudspeaker B. Preparing a classroom for projection 1. Proper selection for acoustic qualities 2. Provision of darkening facilities and electric outlets 3. Type of power supply needed 4. Lenses and picture sizes 5. Placement of the screen, projector, and loudspeaker C. Techniques of operating a 16-mm. sound-film projector 1. Threading the film 2. Controlling the volume 3. Care of the equipment 4. Care and repair of sound film B. TEACHING THE TRAINING COURSE The method of instruction for the training course should be the laboratory-demonstration-discussion type, an ap- proach which is ideally adapted to the nature and functions of the devices being studied. Few classes present such rich and varied opportunities to vitalize the learning through the use of objective materials of instruction. Films should be brought into the classroom, evaluated, considered in terms of child interests, analyzed for their contributions to specific units of work. Indeed, an instructor who endeavored to present the concepts of film teaching mainly through lectures would be denying the utility of that which he is explaining. Almost every phase of the course lends itself to practical exercises and demonstration. In discussing the relationship between the film and other instructional devices direct com- parisons may be made, first by a film showing and then by demonstration of the other illustrative aids. As a part of the study of the standards which should govern the educational sound film, practice in rating films is essential. The integra- tion of audio-visual materials with the courses of study sug- gests actual curriculum-making along this line. Techniques of film teaching may be studied through demonstration les- sons, the preparation of film-lesson plans, and the like. The physical and mechanical aspects of projection, especially