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42 The Audio-Visual Handbook
is applied. Both will remain flat and will join without any tendency to fold, wrinkle, or warp. Second, it is not necessary to rush the process of mounting and an interruption during the process has no disastrous effects whatever. If the person mounting pictures in this way should receive a telephone call or visitor, or should find it necessary to leave the material for any reason, the extra drying of the cement on the picture and on the mounting board will but cause it to adhere more firmly when joined. The third advantage is that the misapplication of some of the cement to the surface of the picture, or on the uncovered edge of the mounting board will cause no damage to either. It is only necessary to rub off the excess dried cement with a clean, soft cloth. Actually, the removal of excess cement in this way will tend to clean the surface of the picture or mounting board, rather than damage or stain either in any way.
Mrs. Charles Joe Moore, Secretary of the Bureau of Visual Instruction, University of Texas, has developed a very interesting use of cellophane to protect the surfaces of mounted pictures. The cellophane is cut in sheets slightly larger than the card upon which the photograph is mounted. It is placed over the front of the picture, with the overlap folded to the back, and cemented there. Thus, fingerprints and dust accumulate on the cellophane rather than on the photograph, and may be removed with a moist cloth.
Filing Pictures. Proper filing of pictures must be preceded by proper mounting. If the picture or mounts are of many different sizes, it will be extremely difficult to arrange any system of filing which will be truly satisfactory. The size of the mounting board should be determined by the size of the space available for filing the pictures. If no special size has been determined, two sizes which have been found to be very satisfactory are 5x7 inches and 8V2 x 11 inches. These two sizes will accommodate the majority of the pictures available for mounting, and there are many filing cabinets for these two standard sizes. The mounting board should be stiff enough to support itself in a vertical position, but not so stiff that it will be cumbersome to handle.
After pictures have been collected from various sources and mounted properly, they should be made accessible to both teacher and pupil with the least amount of inconvenience. In some instances, it may be preferable to arrange the pictures in groups or sets, filing these sets in special envelopes, packets, or folders. Usually it is advisable not to include more than twenty to twenty-five in one group, as a very large assortment will have a tendency to confuse rather than to instruct.