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56 The Audio-Visual Handbook
pupil an unusual conception of the subject matter under investigation. But these vivid individual impressions and definite conceptions become infinitely more valuable when they are expressed in spoken language and discussed by a group. It is thus that facts and principles are fixed. The duplicate lantern slide is by all odds the best means of clinching fully the impressions and of bringing out the implications of the knowledge got by the individual from the stereograph."'"'
The Lantern Slide
The ordinary lantern slide of American standard is 3Vi" x 4" in size, and fits all the common slide projectors. It is usually composed of four or five parts: (1) the slide plate, or glass on which the picture has been printed; (2) a mat or mask, to keep the dimensions of the picture within the size of the aperture gate of the projector; (3) a cover glass, to protect the emulsion or picture of the slide plate; and (4) the binding tape, which is used to fasten the plate and cover glass together firmly and prevent dust or moisture from getting between and damaging the picture. The fifth part may be a piece of cellophane, a paper cutout (silhouette), a piece of Lumarith, a piece of thin paper, or a photographic positive on which a picture or outline has been drawn or printed for projection. In such cases, two cover glasses are used to protect the material in place of the usual slide plate and cover glass.
There are many variations of the above to meet different situations and conditions in which the slides are to be used. The lantern slide has become one of the most useful of visual aids and is being adapted to new purposes from year to year. The more recent development of 2" x 2" slides will extend the usefulness of slides into many situations where extreme portability of materials and equipment and low cost are important. An attempt will be made, in the following discussion, to call attention to the various types of lantern slides and their many possible uses.
Types of Slides
Paper Cutout Lantern Slides. Children in the primary grades may make their own lantern slides to illustrate such stories as "The Three Bears," "The Boy and the Goat," etc. Let the children cut out pictures freehand, using lightweight black paper, or any other paper
* Hamilton, George E., "How to Use Stereographs and Lantern Slides." Reprinted from Educational Screen, November, 1926.