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Types of Visual Aids and Their Uses 73
As suggested before, there is no set time for introducing the slide in the process of teaching a unit of instruction. The slide, depending somewhat upon its type, may be used to introduce a subject; as a part of the study or discussion period; or as a review at the close of a unit of instruction. In each case, thorough discussion and questioning should be provided and permitted.
One of the chief features to be emphasized in connection with the use of slides, or of the majority of the other visual aids, is that the materials and equipment should be readily accessible. If it is necessary for the teacher to go to another school building, or to spend an unusual amount of time locating the projection equipment, and still more time locating the materials, it is quite probable he or she will become discouraged and will fail to make proper use of the materials desired. The ideal situation would be one in which each teacher could have in her room or department a projector and an assortment of slides, including the majority of the slides to be used in connection with her classes. In such a situation the teacher would be able to do her work more effectively with a decided economy of time. Certainly there should be at least one projector in each school building. If it is not possible to assign a projector to each department which will make use of it, the projector should be kept at the principal's office and should be ready for use at all times. It may be desirable to centralize the slide library in the school museum or school library, keeping the projector with the slides, but with the assurance that someone is responsible for its proper care and adjustment.
There are many excellent slides available for sale and for loan to those who may desire to use them. Some of these slides are such that no substitute could be provided. On the other hand, very effective teaching with slides can be accomplished with homemade materials. Pupils may make their own slides or the teachers may make slides to illustrate certain points. The pupil-made slides are particularly effective inasmuch as they call for the exercise of the creative ability of the pupil and provide the effective phase of education — an opportunity for participation and self-expression. Every classroom in which the regular use of slide materials is attempted should be equipped with a homemade slide outfit.*
An outfit for making homemade lantern slides which would be sufficient to provide 150 to 200 slides costs but $14.50 including a very convenient wooden case for the storage of materials. It is exceptionally
*Keystone View Company, Meadville, Pennsylvania.