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66 The Audio-Visual Handbook
the slide is being projected in the lantern.
Coloring Slides. Lantern slides may be tinted slightly by soaking the plate in water which has been colored with pieces of Japanese water color stamps. If further tinting is desired, transparent water colors will be satisfactory. The proper coloring of lantern slides requires both patience and skill, but successful results will more than compensate for the time and energy involved.
After the pupils have made slides successfully, using the above process, they may take up the reducing and enlarging of negatives to the proper size for use in making lantern slides. This will require more equipment. The reduction and intensifying of slides may be learned. It is better, however, to try to make the negatives so well that these processes will not be necessary.
Pupils should be encouraged to make photographs of subjects which may be used in science, geography, history, agriculture, and other classes. Many subjects, such as wild flowers, birds, trees, plants, and animals may be photographed in summer and the pictures transferred to slides for classroom use in winter. The production of lantern slides is an excellent activity for a science club or a camera club. As soon as one or two pupils learn the process well, they will be glad to assist other small groups of pupils and to make special slides for classroom use. Perhaps the club may be given an opportunity to arrange the program for an assembly, at which time the slides can be used.
"Positive" Lantern Slides. Those who may desire to use lantern slides of the same quality as photographic slides and find it necessary to keep the cost of production as low as possible and to reduce the weight of the materials to a minimum, will find that lantern slides made of positive film prints will serve these purposes well. The process is simple. It is only necessary to transfer the picture negative of slide size to a positive film of the same size and place the positive print between cover glasses. Two or three pairs of hinged cover glasses will be sufficient to use in projecting a long series of the positive prints, so a package of fifty to a hundred prints and the hinged cover glasses could be placed in the space ordinarily occupied by eight or ten slides. The process of making this type of print is quite similar to that of making photographic slide plates, except that positive film will be used rather than sensitized glass plates.
Advantages of Glass Slides. As the reader may have gathered from the foregoing statements, the glass slide offers the most com