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The Optical Magic Lantern Journal and Photographic Enlarger.
pendicularly, the tips of the hairs are allowed just to touch the surface of the soot (Fig. VII.). Wherever the soot is touched by the brush, it is removed, and the high lights produced.
The glass is then given another coating of soot. ‘The left side of the crater, where the soot has been stippled off, will thus be of a light brown colour, whilst the remaining parts will be of a darker hue.
The brightest lights, on the top edges of the mountains surrounding the crater, where the sun catches them, are then put in by totally removing the soot with the fine steel point, leaving the clear film.
The slide is then bound up in the usual manner, the only difference being that a rather
thicker mask than that usually employed is cut out and placed between the glasses, so that the sooted surface is prevented from coming into contact with the other glass.
When exhibited’ in the lantern a beautiful effect. is obtained, the varying shades of soot producing a bold relief—an effect which cannot possibly be shown in an ordinary line drawing such as Fig. VI.
The next slide will represent the proportions of several planets. First of all discs of paper are cut out to the required diameters, and then attached temporarily to the film side of one of the fixed lantern plates by being slightly damped in the centre. Small hinges of stamped paper
are fastened to their backs so that they can be
|; the method previously described.
easily lifted off again when desired. The side of the plate to which are attached the paper discs, is then covered with soot in the method described. The discs are then carefully lifted off so as not to disturb the soot, and the plate placed in the recess in the desk, of course with the sooted surface upwards. Parallel lines of varyiog lengths are then ruled across the clear circles representing the planets—China black ink being used, and the aid of the bridge hand rest (Fig. VII.) being called into requisition.
Fig. VIII. represents the slide so prepared. It is bound up in the manner described.
The next slide, the method of preparation of which I will describe, has for its subject the markings of Mars (Fig. IX.).
A disc of paper is cut out, and in it are cut the openings 1 and 2 (a, Fig. TX.),. representing the shapes of the
markings—which of course vary according to the aspect of the planet. This perforated disc is then temporarily attached to the surface of a plain lantern cover-glass in The glass is then sooted. The paper disc is removed and the slide will have the appearance of B. Another coating of soot is then allowed to accumulate upon the glass, when it will be like c ; the white portions of Mars in B having become light brown, and the other portions, z.e., the markings and surrounding edges of the glass, being made still darker in colour by the second coat of soot. Any high lights may then be put in by stippling, and the slide bound up as before described.
Ihave said enough now to show the lanternist what a variety of effects, particularly adapted to the purpose of making astronomical slides, may be produced by the judicious utilisation of soot.