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Author's Note
THE major purpose of this book is indicated by its title — a handbook of information in convenient arrangement for those who should be interested in using audio-visual aids to instruction. It is intended primarily for those in either of two general classifications: (1) educators in service who desire brief general information concerning audio-visual aids to learning, as well as a guide to sources of materials and further information; and (2) students in teachertraining institutions, whose desires should include the same.
This book is limited in size for one principal reason: to provide a service manual at moderate cost. It would have been easier to have included more material, rather than choose that which seems to be of greatest general value. There are numerous other sources mentioned from which more detailed information may be secured.
The first edition of this Handbook was published in 1934. It was then planned that there should be frequent revisions to keep pace with the many new developments in the audio-visual field. Accordingly, this, the fourth edition, contains much information concerning new materials and equipment and their sources. There will be future revisions as required to provide an up-to-date source of information.
The need for such a source book was evidenced earlier by the unusually large number of inquiries from school people requesting this type of information. It has been evidenced since by the steadily increasing demand for this and other publications in the audio-visual field. Fortunately for school people, both the quantity and quality of such publications have increased appreciably during the past few years.
It is not pretended that this publication includes even a major portion of the detailed information required to explore the audio-visual field thoroughly. Instead, it provides an outline which might well be used as the base for such exploration as may be possible within the time limitations of audio-visual courses or individual research.
E. C. D.