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?HE UNIVERSITY OR COLLEGE FILM LIBRARY
in the 16-millimeter width. A few of these film libraries added 16-millimeter sound-on-disc materials during that brief period of experimentation with sound as an added element. Sound-on-disc collections, of course, gave way to sound-onfilm. In the early thirties the number of creditable teaching films was relatively small. The concept of the basic curriculum film was just emerging. Projection equipment in the schools was not abundant. Important evaluative research studies of the film as a teaching tool were just being completed. Many educators were not favorably disposed to the classroom film. These factors naturally affected the growth of college and university film libraries both in the numbers of such agencies and in the character and extent of their offerings.
Since 1937, many of the retarding factors have been eliminated. By 1935 the mechanics of 16-millimeter sound film projection were perfected. After 1937, film projection equipment became more generally available. More creditable films pointed to the curriculum of the schools were produced. World War II provided a practical test of the potentialities of the training film, "sold" educator and layman alike on audio-visual tools, stimulated the entry of new film producers, and provided literally hundreds of quality films for the educational field. It is not surprising that the film library curve (Figure 1) begins to soar during this period.
EDITOR'S NOTE: It is interesting to compare the growth of university and college film libraries reported here by Mr. Lemler with the historical development of the educational motion picture (see Chapter I "The Genesis of the Educational Film"). It is not too difficult to see that educational institutions were waiting to take advantages of the educational film, but were awaiting only the necessary technical improvements which would permit easy handling of the motion picture in school situations.
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