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152 The Audio-Visual Handbook
(a) Direct communication with teachers or pupils in any classroom, without interfering with classroom procedure by calling on a telephone or by sending a messenger.
3. Emergency:
(a) Principal may locate a teacher or, a student quickly in case of an emergency.
(b) In case of fire, pupils may be directed along routes which avoid danger. Fire drills and other safety precautions may be directed to any or all parts of the building.
4. Discipline :
(a) Absence of the teacher from the classroom does not leave the pupils without control.
(b) Natural-voice amplification in the auditorium lessens restlessness and avoids disciplinary problems.
5. Increased efficiency:
(a) Eliminates the necessity of frequent special assemblies.
(b) Where the school auditorium is too small to accommodate the entire student body, the programs may be sent from the auditorium to overflow groups of students in classrooms or study halls.
6. Student training:
(a) Student-council discussions of important problems may be relayed to the entire student body.
(b) The reading of the Scriptures or other opening exercises may be conducted over the sound system.
(c) Presentations of radio guild productions, plays, musical programs, voice training, public speaking, microphone techniques — all may be accomplished by students.
(d) Students develop poise by presenting special reports to one or more classes in history, English, literature, science, etc.
(e) Members and leaders of clubs, classes, and other school groups can use the system for appropriate announcements to the student body.
7. Controlled testing:
(a) Psychologists may give controlled tests to similar groups in unison, thus avoiding variation in the testing procedure which might effect the validity of the results.
(b) Teachers may give the same tests to two or more sections simultaneously, with assurance that the timing factor is controlled.