The audio-visual handbook (1942)

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Types of Visual Aids and Their Uses 75 teaching value. If it contains too much material, or not enough, or is poorly arranged, or is not clear in certain parts of the picture, the pupils will lose interest in it. There should be a concentration of attention on the essential elements to be noted or illustrated with the slide. If a slide of a certain important building is to be shown, that building should occupy the center of the picture and the surrounding elements should be in the background. If an object in nature is to be presented in slide form, that object should be the central attraction of the slide itself, and the other objects which surround it should become secondary. The mechanical make-up of the slide is very important. The mask which "frames" the picture should be placed accurately, giving the picture a smoothness and regularity which would not be the case if the mask is placed at an angle or is irregular in its border lines. In making slides it is much more satisfactory to purchase at small cost a set of masks which have been prepared with mechanical precision. This will give a uniformity to the slides which will be pleasing to the eye and will avoid distraction of the attention. The slides in any one set or group should be of exactly the same picture size, if it is possible to arrange them in that way. Preparing Collections of Glass Slides. Those who are interested in making the most effective use of slides will find it advisable to accumulate gradually a collection of materials which will be particularly suitable for the courses in which they are to be used. One of the first elements to consider in arranging such a collection is the cost of the materials. Ordinary black and white photographic slides range in price from 35c to 75c each and tinted slides will range in price from 65c to $2 each, depending largely upon the care required and exercised in the coloring. The cost of the materials themselves will make it advisable for the teacher to be very careful in the selection of materials to be added to a permanent collection. Of course, many of the slides in the collection will be teacher or pupil-made and this form of slide is not expensive. Perhaps the next consideration will be care in determining just which slides should be colored and which should be black and white. A simple rule to be applied in making this decision is to ask whether or not color will add materially to the value of the slide. If not, certainly there is no justification for the extra expense incurred in preparing or securing a tinted slide. There are many situations in which the color will add considerably in giving a true impression of