Viewgraphs, ContinuedOverlaysThe use of overlays is one of the most effective features of overheadprojection. Using overlays is one way to turn a static display into a dynamicdisplay. Overlays progressively and selectively reveal elements and portionsof information to enhance communication. Mount the base foil to the mountfirst. Fasten each overlay with tape or commercially available hinges on theleft or right side of the veiwgraph. If mounting multiple overlays in a givensequence, tape them all on one side of the mount. This ensures that they willalways appear in order. If there are many overlays for consecutivedisclosure, start taping the overlays on the right side, working clockwise untilthe last overlay is taped along the top edge. Trim off any excess acetate tomake the overlay lie smoothly against the mount. Attach small tabs of tapeto the edges and number in sequence.Figure 2-26 shows a multiple foil overlay.Figure 2-26. —Multiple foil overlays.Continued on next page2-45
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