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Types of Visual Aids and Their Uses 41
of Mexico, pictures of Central and South America, illustrations of interesting spots in Peru, and possibly a number of interesting scenes of Cuban life, these are all within a single cover and accessible only to one or two pupils at one time. It may be that one child will be interested in Peru, while another will want information concerning the cities of Mexico, and still a third will want to study Cuba. If the pictures remain within the magazine, one must wait for the other. On the other hand, if the pictures are removed from the magazine, mounted properly, and filed in an accessible manner, each will be able to have his or her study material at the same time.
One of the chief difficulties encountered in the mounting of pictures has been that of fastening the pictures to the mounting board in a permanent manner, without damaging the pictures. The majority of the ordinary forms of paste and mucilage tend to wrinkle the picture or cause it to bend out of shape when the paste is applied. A similar reaction occurs when it is applied to the mounting board — the picture curls one way and the board bends the other. The mounting must be done with haste and the mounted pictures placed under a press or weight to flatten them as they dry. If any of the paste or mucilage goes astray on the face of the picture or on the edge of the mounting board, it causes a serious stain.
These difficulties can be eliminated by using a very simple and inexpensive type of adhesive. It is only necessary to go to the nearest drugstore or stationer and purchase a small can or tube of clear paper or rubber cement. Usually a small bristle brush is furnished for convenience in spreading the cement. If not, any small, stiff brush will be satisfactory.
The technique for using rubber cement to mount pictures is very simple. If the cardboard on which the picture is to be mounted is 8V2 x 11 inches in size and the picture approximately 6x9 inches in size, a space on the mounting board approximately 6x9 inches in size should be coated with a thin layer of the cement. The back of the picture should be coated similarly, and both should be permitted to dry — the drier they are, the tighter they will stick when put together. After both surfaces — the back of the picture and the front of the mounting board are dry, place the picture in position on the mounting board and press down firmly with a soft cloth or with the hands. The picture will adhere firmly and will so remain indefinitely.
The use of rubber cement for this purpose presents many advantages, three of which are especially worthwhile. In the first place, neither the picture nor the mounting board will warp or bend when the cement