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INDEX 171 Maintenance, 16-mm. equipment, 119- 20, 122-23 Manipulating the film showing, 56-61 Manual of operation, 119 Manuals, film, 36, 69, 71 Materials of instruction classified, 2 function of, 1 selection of, 74 Materials of Instruction: Eighth Year- book, Department of Supervisors and Directors of Instruction of the Na- tional Education Association, 109 Measuring the Effectiveness of Sound Pictures as Teaching Aids, 3, 108 Mechanical problems, film use, 114 Microcinematography, 4, 8 Microphone, use of, 50 Micro-projector, 69 Minimum standard equipment, 93-94 Molecular Theory of Matter, 18, 26, 68 Moths, 47-48, 55-56, 92 Moths and Butterflies, unit, 47-48 Mountain Building, 107 Music, use of films in, 24, 26, 32-35, 37, 40, 51, 53, 67 New York University, 102 Noon-hour program, films for, 37 Normal school use of films, 26, 27 Objectives aided by film use, illustrated, 15-16 Objects and specimens, creating inter- est with, 54 Oiling projectors, 119, 123 Operation of 16-mm. sound-film pro- jectors competence required, 119-20 description of, 118-19 operation service, 117-18 special projectionist, 120-22 teacher and student operators, 82, 119-21 training in, 119-21 Operator's licenses, 123 Oral composition, 67 Organizing an audio-visual program, problems of, 73 Organizing knowledge, use of film for, 30-31 Organizing new activities after the film showing, 67-69 Organizing services, film program, 83-88 Original songs, composition of, 67 Our Toum, 34-35 Parent-teacher meetings, 40-41 Pennsylvania State Course of Study in Science — Grades Four, Five and Six, 92 Percussion Group, The, 38 Photoplay appreciation, 95 Physics class, film use in, 31 Pictures, use of, 22-23, 30, 53, 54, 67, 68, 69 Pittsburgh, Pennsylvania, 112 Planning the film program, 10, 79-83 film unit, 12, 13, 45 Plant Growth, 19, 26, 31-33, 44, 54, 92 Plastic modeling, 68 Platoon school, use of films in, 19-23, 52-53, 94, 128, 139 Poetry, in connection with film use, 23 Pond Insects, 27 Potwin, C. C., 130 Preparatory teaching, 51-52 Preparing for film use, 12-13 Preteaching film outline, 46 words in film, 46-47, 52 Presenting part of film, 47 Previewing of films, 27, 50, 81-82, 89-91 Previous experience, adjusting film use to, 45 Primary grades, use of films in, 15, 34- 35, 47-48, 52-53, 55-56, 58, 67-68 Primary Teacher at Work, The, 38, 41 Principal, supervisory function, 109-10 Principals, activities of, 80 Principals' meetings, topics for discus- sion, 110 Private school, use of films in, 28, 37-38 Program, audio-visual instruction (see Audio-visual instruction program) Program for the Utilization of Audio- visual Teaching Aids, Evansville, Indiana, 88 Projection booth, 128, 130