The Perspective Mirror





Provide a box, A B C D, Fig. 24, of about two feet long, 15 inches

wide, and 12 inches high. At the end A C, place the concave mirror,

the focus of whose parallel rays is 18 inches from the reflecting

surface. At I L place a pasteboard, blacked, in which a hole is cut,

sufficiently large to see on the mirror H the object placed at B E F

D. Cover the top of the box, from A to I, close, that the mirror H may

be entirely darkened. The other part, I B, must be covered with glass,

under which is placed a gauze, or oiled paper, to prevent the inside

from being seen. Make an aperture at G, near the top of the side E B,

beneath which, on the inside, place in succession, paintings of

vistas, landscapes, figures, &c., so that they may be in front of the

mirror H. Let the box be placed that the objects may be strongly

illuminated by the sun, or by wax-lights placed under the enclosed

part of the box A I. By this simple construction, the objects placed

at G D will be thrown into their natural perspective, and if the

subjects be properly chosen and well executed, the appearance will be

both wonderful and pleasing.





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