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612 MOTION PICTURE HANDBOOK
and, 1, 2, 3, 4, 5, etc., until the chorus slide is reached, being sure that the spot-mark of all slides is in the same corner. He now turns the whole pile over and runs through them, glancing at scenes to check up the spot-mark, and to see that the tops of all slides are in the same position. He then lays the pile of slides on the machine table with the top of the scenes toward the lamphouse. In running them he picks each slide up by the right-hand corner nearest to him. He will thus be grasping the lower left-hand corner of the slide, which will be the upper right-hand corner as it goes into the carrier in an inverted position. In removing the slide from the carrier he will lay it down with what was the top edge of the slide, as it stood in the carrier, toward the lamphouse. Follow the directions through carefully and you will discover that he has simply turned the slide over in the process, and as he takes them out, one by one, and thus lays them down he will have their order exactly reversed in relation to the way they originally laid, so that the title will be on the bottom, and the top of the slide away from the lamphouse. Under these conditions, when a song is finished all you have to do is to turn the whole pile over and they are ready to run again.
The operator who follows these directions closely will never get a slide in bottom side up. In a short while the whole thing becomes a semi-automatic performance, and he would no more dream of picking up a slide and putting it in the carrier and taking it out and laying it down in any other way than as before indicated than he would think of putting a spoonful of food in his ear instead of his mouth.
In event a slide becomes cracked, it may be made as good as new if the crack is in the cover-glass — remembering that the cover-glass is always on the mat side of a slide. In that event all one has to do is remove the broken cover-glass and put in a perfectly clean, new one, rebinding the slide as it was before. If, however, the crack is in the photograph the damage is past remedying. Gummed slide binding tape may be had from any exchange, and should be a part of the equipment of every operating room.
Advertising Slides. — It is quite possible and practical to make slides designed to convey various messages to the audience, and many are the schemes which have been evolved for this purpose. The highest grade slides of this character are, of course, made by photography. The most satisfactory photographic slide is made by lettering a black card with white paint. Any size card from 6 by 8 inches up to 2 feet