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Types of Sound Aids for Schools 149
space or group where the program is utilized.
The selection of sound re-enforcing equipment for any purpose should be based upon the recommendations of a sound engineer who is familiar with the requirements. Frequently savings may be effected or more satisfactory equipment may be secured by observing this suggestion. The principal manufacturers of sound equipment are prepared to provide such advice without cost or other obligation to the school. In one instance a school which made use of this service was able to secure a thoroughly satisfactory sound re-enforcing unit at approximately $100 less than the estimated cost based on catalog information. There are occasions, also, when one type of microphone may provide much more satisfactory service than another, therefore, its selection should be based upon the recommendation of a sound engineer.
School Radio-Sound Systems
Another comparatively recent development in the sound field is a combination of radio reception, sound reproduction, amplification and distribution equipment, generally known as a school radio-sound system. This equipment makes it possible to convey any type of sound to any or all rooms within a school building or group of school buildings. The usual arrangement of such a system is to provide for a central control apparatus in or near the office of the school principal, making it possible for him or for one of his assistants to send a radio program, music or speech from a phonograph record, announcements, lectures, debates, plays, or any other type of program to any room, series of rooms, or to the entire building.
The cross-section illustration (page 150) shows how the centralcontrol unit is connected to various rooms. Another illustration (page 154) shows the detailed arrangement of the control mechanism which makes it possible for the operator to distribute programs as desired. For example, it is possible to send to the classes in geography a program in which those groups would be interested. At the same time, the classes in history or general science might receive an entirely different program. It is also possible that the principal might desire to make certain announcements to still other groups without interrupting those who are receiving the geography, history, or general-science programs. The central-control mechanism makes it possible to accomplish all this with ease, thus providing an adaptability which could not be accomplished as readily in any other way. A good school radio