Elements of natural philosophy (Volume 2-3) . THE MAGIC LANTERN. Magic lantern; § 89. This consists of a small close chamber, fromone side of which proceeds a tube containing usuallytwo convex lenses A and B, with an intermediate open-ing for a glass slide C, which may be moved freely in Essential parts; a direction at right angles to the common axis of thelenses. Within the chamber is an Argand lamp D, Fi<?. 03. Graphicrepresentation;. behind which is a concave reflector E. The rays pro- ELEMENTS OF OPTICS. 265 ceeding from any point in a figure, painted with some °Pticaltransparent pigmen
Elements of natural philosophy (Volume 2-3) . THE MAGIC LANTERN. Magic lantern; § 89. This consists of a small close chamber, fromone side of which proceeds a tube containing usuallytwo convex lenses A and B, with an intermediate open-ing for a glass slide C, which may be moved freely in Essential parts; a direction at right angles to the common axis of thelenses. Within the chamber is an Argand lamp D, Fi<?. 03. Graphicrepresentation;. behind which is a concave reflector E. The rays pro- ELEMENTS OF OPTICS. 265 ceeding from any point in a figure, painted with some °Pticaltransparent pigment upon the glass slide and strongly fn^^nftheilluminated by the lens J_, upon which the direct light explained;from the lamp, as well as that from the reflector E,is concentrated, will be brought to a focus by the lensj5, on a screen MN, placed at a distance in front ofthe instrument; here the light being reflected will pro-ceed as from a new radiant, and a magnified image ofthe figure will thus appear upon the screen. Shouldthe screen be partially transparent, a portion of the lightwill be transmitted, and the image will be visible to anobserver behind it. The linear dimensions of the object or figure, will delation between n i • i . the dimensions of be to those ot the image, as their respective distances the object andfrom the lens B; if, therefore, the lens B be mountedimage;in a tube which admits of a free motion in that co
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