(2) Mounting the overlays.
As you learned in lesson 1, a
viewgraph (in this case the base) film mounts to the back of the frame.
Each overlay mounts on the front of the frame. When you must present the
elements of the overlay in a specific order, mount each overlay on the
same side of the frame. This also allows you to position them while on
specific order, mount them on alternating sides of the frame. This way
the overlays so they all fall into place easily.
You also can attach small tabs of masking tape or adhesive-back labels on
the loose upper corner of each overlay. You can grasp the tabs easily
when placing the overlays in place over the base element.
(3) Using overlays.
Figure 2-28 shows the use of graphic
Since the overlays mount on each side of the frame, that
indicates you do not have to present them in a prescribed order. In this
figure, the base element is the star with no shading in any points. As
you position each overlay, you add shading to each point.