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hypo bath, washed and then dried—thus being |
left perfectly transparent ; a small oil Jamp such as shown in Fig. V.; a brush, shown in Fig. VII. ; a long piece of wood or steel finely pointed at one end, and some writing paper.
It may be mentioned here that the film on the fixed lantern plates gives a grip to the point of a bow-pen, when any circles are required to be drawn on it.
When the necessary apparatus has been prepared, the lanternist is ready to begin the actual work of making the slides. For the purpose of guiding him in thcse operations, I will briefly describe how to make a few slides to illustrate certain astronomical phenomena; the slides that I have chosen: being some of those that I have myself actually prepared.
The Optical Magic Lantern Journal and Photographic Enlarger.
99
point, which removes the soot, leaving clear glass. Where it is necessary to give gradation in degree of light, stippling with a dry brush and re-sooting must be done—operations which will be described presently.
The case is then closed as described, and the slide is completed. When placed in the lantern, the comets will, of course, show out white upon a dark background—and as the soot will not have been deposited absolutely evenly all over the surface of the glass, this background will be
, of a cloudy nature—thus giving a very good
atmospheric effect. Now I will show how to make a slide to
| illustrate a typical lunar crater (Fig. VI).
Upon the film ‘surface of one of the fixed lantern plates is sketched in China black ink
Suppose we desire to make a slide to illustrate a few of the comets (Fig. I.). One of the hinged cases previously described (Fig. III.)
sooted. This operation is performed by holding
the glass just above the wick of the oil lamp, |
which is turned up rather high to permit of its smoking (see Fig. V.). about to allow the soot to be deposited on its surface fairly evenly. Any desired shade may
soot to be deposited.
When dark enough, the glass is Jaid in the recess of the desk before mentioned (Fig. IT.), with the smoked surface upwards, and the
comets are drawn on it by means of the steel |
is taken, and one of the interior surfaces :
The glass is then moved |
the outline of the crater. Such illustrations may, of course, be traced by laying the plate over the illustration in a book or magazine. The black shadows cast by the sun (which is supposed to be shining down upon the crater from the left hand side) are also filled in with this ink.
The film side of the plate is then given a
; coating of soot, till a light brown colour is : obtained. be obtained by allowing different quantities of |
Portions of the soot on the left hand side of the crater are then stippled off. This operation is performed by the following method :—The hairs of the brush with which the lanternist has provided himself, after being thoroughly dried, are spread out, and the brush being held per