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128 The Audio-Visual Handbook
to any great extent. These screens range in price from 40c to $1.25 per square foot, including a permanent mounting or shade roller. If the screen is to be extremely large, it will be better to have it mounted on a frame than on a roller. The rolled screens have a tendency to become frayed at the edges and wrinkled after some years of service.
Types of Screen Mountings. Screens may be secured on tripods, in boxes on solid frames, on covered or uncovered rollers to be hung against the wall, or on rollers to be suspended from the ceiling. A selection of the type of mounting should be determined by the situation in which the screen is to be used. If there is a railing above the blackboard in the classroom in which two small hooks or nails may be easily placed, these can be used to suspend one of the screens mounted on an ordinary shade roller either covered or uncovered. However, it will be necessary to have these nails or hooks placed in each room where the screen is to be used, so if it is not convenient to make such a provision, it will be better to purchase a screen on a tripod which can be easily adjusted. Any of the companies listed on page 221 will be pleased to send complete descriptive materials and prices concerning all types of screens. These screens range in price from approximately $10 upward, depending upon the size of the screen, the quality of the screen surface, and the type of mounting selected.