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Types of Visual Aids and Their Uses 77
that the crack will not show on the screen.
It is necessary in arranging for the distribution of slides among the various rooms or buildings in the school system to arrange some method which will be convenient and reliable. Usually the ordinary slide shipping cases are the best to use inasmuch as they may be subjected to rather rough handling without damaging the slides themselves. If a very cheap form of carrying case is desired, it may be made from heavy corrugated paper or of pressed fiberboard. These cheaper cases will require more careful handling but, unless the materials are to be sent long distances, there should be very little danger from damage or breakage.
Prepared Assortments. Keystone* has prepared special collections or assortments of slides for use in various levels and subjects of instruction. One set is prepared especially for primary work and other sets are designed more particularly for the intermediate and upper grades. These sets contain some 150 to 600 slides, duplicate stereographs thoroughly cross-indexed, and a teacher's manual which contains helpful suggestions.
In addition to these very large and complete assortments, the Keystone Company provides selected groups of slides for special subjects in the fields of general science and geography. These are arranged in small sets of fifteen to twenty slides each, keeping the sets within the recommended size for ordinary school use. Other special sets of this nature are available from the various sources mentioned on page 217.
The large collection of miniature Kodachrome (natural color) slides, now offered to schools by S.V.E.,** is not organized into specific units but many pictures from each of several fields are available for the selection of the most appropriate series for any given situation. It is possible to select slides which will have several applications in the teaching of various subjects.
Projection Equipment. A few years ago it was rather difficult to select suitable projection equipment for the use of glass slides. There were many projectors available which were offered at a wide range of prices. Each was supposed to be the best in its field, and the person interested in purchasing was left somewhat in a quandary by the various representations. At the present time, however, there are but three or four leading makes of projectors and any one of these instruments will give very good results in the average situation.
*Keystone View Company, Meadville, Pennsylvania.
**Society for Visual Education, Inc., 100 East Ohio Street, Chicago, Illinois.