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FOR MANAGERS AND OPERATORS
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properly done a reasonably sharp and fairly good slide is produced, though of course it does not compare with the photographic slide. In addition to this, colored inks are produced with which one can write on clear glass, using an ordinary pen. If carefully made, slides of this kind present a pleasing appearance, and they have the advantage of being cheaply and quickly made. "Glassine," made by the Thaddeus Davids Company, New York, is such an ink. It comes in several colors and is excellent.
Slide Coatings. — Dissolve dry gum dammar in turpentine and allow to stand until it settles. The proportion, by measure, is about one of dry dammar to twenty of turpentine. Very thin, yes, but it does the trick. To coat hold a clean cover glass level, pour on some solution, allowing it to spread over the entire surface. Then allow the surplus to drain back into the bottle from one corner, and stand the glass on end to dry. Glass treated thus may be written on with an ordinary pen and ink just as one would write on paper. It will require several jtioars to dry, but the writing may be washed off with turpentine and the coating used many times. It is difficult to tell wLich is the coated side. Therefore a small gummed sticker should be affixed in one corner or a permanent mark made with ink. Gelatine may also be used for coating, the process being as above, substituting for the dammar coating one made by dissolving in :hot water clear gelatine, which can be had from any grocery or drug store, in proportion of one measure of gelatine to ten of water. This coating is fairly satisfactory, but can only be used once. The solution should be passed through filter paper before using, or at least be strained through very fine cloth.
Those making many Figure 297.
slides of this kind will
find the following a great help: Get a board, either basswood or clear, soft pine, of convenient size, say 12 inches square. On one surface paste a sheet of white paper, six or eight inches square, and on this paper paste an ordinary