The sciopticon manual, explaining lantern projection in general, and the sciopticon apparatus in paricular (1877)

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SCIOPTICON MANUAL. 141 sharp instrument so as to show upon the screen in smooth white lines upon a dark ground. The varnish must be thinned with turpentine, to allow of tracing by superposition. This process, obtained by purchase, is given for the benefit of teachers, who will find it admirably suited for maps, diagrams, and any so-called blackboard exercises. ORDINARY TRANSFERS UPON GLASS. —Coat, by prefer- ence, quarter-plate B. P. C. glass on the hollow side with transfer varnish, and let it partially dry. Take any cut of proper size, place it upon water right side up un- til it becomes wet to saturation, adjust it to the varnished surface face down, rub up the paper in rolls until it is mostly removed, and then lay it aside until the varnish becomes hard. Much of the remaining paper can now be removed without damaging the picture, by carefully wetting and rubbing. Grecian varnish will render the picture transpar- ent; but unfortunately innumerable pimples make their appearance, which show badly on the screen, caused by the loosened fibres of the remaining paper film. Several coats of varnish will finally leave a smooth surface, but so thick a coating will before long crack and eventually peel off. This process is here referred to because it is so often inquired about, rather than because it is thought to be of much value. DIAPHANIE. —A picture on thin, smooth paper, treated as above, but without rubbing off any of the back surface or even roughing it up, will make a tolerable lantern slide, with one coat of the varnish. It will ap- pear dark on the screen like a silver print that is very much "fogged." If the picture is pasted to a frame