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Types of Visual Aids and Their Uses 59
be obtained. Furthermore, these colors may be mixed to form any desired shade or tint. An assortment of six colors of lantern-slide ink may be purchased at a cost of $1.50.
It is possible to use the lantern-slide ink on plain glass. The ink adheres to etched glass better, however, so it is recommended that the etched glass be used in most cases. Inasmuch as the colored lanternslide ink is more difficult to use than the colored pencils, it is recommended that the ink slides be made by advanced students or by the teacher. If the slides are not to be used again, the pictures may be removed by using ordinary soap and water.
The usual procedure to be followed in making ink slides on etched glass would be approximately the same as for making the pencil slides. A small brush or pen should be used to color the outlines of the picture. If the ink seems too thick or too dense, thin it with water.
A second-grade class was studying "The Science of Spring." One of the activities which grew out of the unit of work was to make lantern slides of fifteen different birds they had observed and studied. They used the colored inks and made slides of the red-headed woodpecker, red-winged blackbird, cardinal, blue jay, meadow lark, robin, and bluebird. Only the most prominent colors were painted on each bird. The unit of work was finished by giving an assembly. As each slide was projected on the screen, a pupil gave a report of the different things learned about each bird.
Ceramic Pencil Slides. The ceramic slide is a type of lantern slide which the children in the primary grades may make most successfully. Either cover glass or etched glass may be used, although the etched glass is more satisfactory. Cover glasses must be absolutely free from dust and corrosion or the pencil will skip across the surface without leaving an impression on the glass. It is possible, however, to coat ordinary cover glass with a thin emulsion of clear shellac to provide a surface on which one may write with a ceramic pencil, with India ink, or tint with water colors. The shellac can be obtained at any drugstore in small quantities, and should be thinned to about one half the usual consistency.
After the slide thus made on the shellacked cover glass has served its purpose, it is very easy to dissolve the shellac and wash off the picture with industrial alcohol or any of the other common solvents. Then the cover glass may be coated again and used for making another slide.