Scientific amusements . Fig. g6,—A Curious Experiment in Rotatory Movement-Attraction. cases when a flexible fan is employed there is have performed this really curious experiment in thepresence of many savants, and have arrived at the con-clusion that the disc of paper is attracted by the fan-plate,Which in its sudden fall creates a vacuum, and the surfaceof the paper is attracted towards the operator. MECHANICAL T0Y3, MAGIC GLASS. 123 A skilful chemist, M. Wideman, has supplied a is a square of glass perfectly plain, on which no drawingor any lines can be di
Scientific amusements . Fig. g6,—A Curious Experiment in Rotatory Movement-Attraction. cases when a flexible fan is employed there is have performed this really curious experiment in thepresence of many savants, and have arrived at the con-clusion that the disc of paper is attracted by the fan-plate,Which in its sudden fall creates a vacuum, and the surfaceof the paper is attracted towards the operator. MECHANICAL T0Y3, MAGIC GLASS. 123 A skilful chemist, M. Wideman, has supplied a is a square of glass perfectly plain, on which no drawingor any lines can be distinguished even after minute investi-gation. But if any one breathes on the surface of theglass a figure such as in the engraving appears. Thefigure will disappear immediately the breath has evaporated. Fig. 97.—The Magic Glass. On the Left the Transparent glass ; on the Right the Sanie after being breathed on. from the glass. You may wash and rub the glass, butthe image will again appear if the plate be breathed explanation is simple. Prepare the, piece oflooking-glass, and let the operator draw upon it anydesign he , chooses with some fluor-hydric acid, which is,obtained by dissolving some powdered fluor spar in the 124 MECHANICAL TOYS, ETC ordinary sulphuric acid of commerce. When it is suciently liquefied the figure should be traced on the glasswith a quill-pen. Leave it for a few minutes—five to tenat the most. Wash the glass and dry it well. Thenwhen it is breathed upon the figure or design will appear.
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
