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146 The Audio-Visual Handbook
or to record any type of individual or group performance. In addition, it may be used to reproduce, through the radio-sound system, any type of disc recording — phonograph record or transcription.
A more recent development in the field of instantaneous recording, is a recording and playing back instrument which utilizes magnetic tape. This instrument provides for the recording and the instant playing back of a few minutes of speech or musical performance but does not provide a permanent record of that performance. Such a record may be produced by re-recording from the metal tape to a disc recording. The instrument does provide excellent facilities for practice and the correction of difficulties in performance.
The possible and practical uses of instantaneous recording equipment are almost unlimited, and new uses are being discovered daily. It is used in all grades and with adults to detect and correct speech irregularities or difficulties. Such recordings permit the pupil to hear himself as others hear him — and he knows the recording doesn't lie! They also permit the pupil to measure his own progress by comparing early recordings with later ones.
Teachers of speech, dramatics, languages, and other subjects involving speech and voice training, have long needed some objective measure or means of making a comparison of progress. Usually progress or lack of it can be detected during a semester or a year, but frequently the change is so gradual that it is difficult to determine its extent after or during any given period of instruction. Accordingly, teachers of those subjects are finding it exceedingly important to make recordings of speech or other individual performances at the beginning of a course of training so these recordings may be compared with later recordings by the same pupils after they have received a part or all of the scheduled training. There is no other way to secure an objective measure of progress.
Teachers of music, vocal or instrumental, are faced with much the same problems and will find a good recorder to be a first-class assistant. There are many times when music teachers would welcome an opportunity to let Johnny or Mary, or an entire group of pupils, know how he. she, or they really sounded in performance. The recorder provides an accurate sound photograph which will be helpful to both pupil and teacher. Furthermore, it will eliminate the personal element and errors of human judgment.
Individual pupils or groups of pupils who perform in radio programs are required to perform with split-second accuracy. Again, a good recorder will be invaluable in rehearsals. Sometimes these record