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216 PREPARATION OF LANTERN SLIDES [Cn. VIII
§ 334. Mounting lantern slides. — In the original method, which is still followed to a certain extent, each slide was mounted in a wrooden frame — that is, each slide had its own carrier which was put in place when it was to be shown (fig. 15).
For teaching and for many other purposes glass lantern slides arc not now put in separate wooden frames, but are covered with a clear glass (cover-glass) of the same size and the two bound together by adhesive paper. They are far less bulky in this way of mounting, although they are not as well protected as in the earlier form.
In mounting them the slides are thoroughly dried, then some form of opaque mat or mask is put over the picture on the picture side of the transparency or negative. There are on the market masks or mats of various shapes and sizes of opening. These may be used or masks may be made by using strips of black paper.
When the mat is in place a cover-glass of exactly the same size as the lantern slide is thoroughly cleaned and placed over the picture surface of the slide. Then a narrow strip of adhesive paper is put all around the edge. This holds the slide and the cover in position, and prevents the sharp edges of the glass from cutting the fingers when handling the slides. The mat not only cuts out any part which is not to be shown, but it separates the cover-glass slightly from the picture and prevents rubbing or other injury to it. The size and shape of the opening in the mat to give the best effect depends upon the picture or other matter on the lantern slide. The mat is a kind of frame and like any other frame it should be suited in form and size to the object to be shown.
§ 335. Marking or "spotting" the mounted slides. — As
pointed out in Chapter I (§ 23) each slide should have some kind of
Kodak Company recommend that the film slides be used only with a magic lantern having a water-cell (fig. 2, 3).
Furthermore, even if non-inflammable film were used, it would not do to leave those slides in a lantern without a water-cell too long for the heat would make the celluloid buckle and get out of shape or char it, although of course it would not be set on fire.
The lightness rind small space1 required for such slides arc of great advantage, but their limitations are so great that for the general, and rough usage of ordinarv lantern slides they are not so well adapted as glass slides.