THE MAGIC CUBE-BOX.
An illusion is often practised at fancy fairs and bazaars, when a spectator, looking into what he supposes to be an ordinary looking-glass, sees his companion instead of himself. Of course the exhibitor endeavours to show the illusion to two persons at once; and if they are strangers to each other, and of opposite sex, a great deal of fun is made out of the trick. Showmen at the fairs have made immense harvests by showing two such mirrors, one to all the young girls who wished to see their future husbands, and the other to all the young men who wished to see their future wives.
Explanation.—Make a cube-box, fifteen inches, say, each way, and stand it on a pedestal to bring it to the height of the eye. In each side of this box let there be an opening of an oval form, ten inches high and seven wide. In this box place two mirrors with their backs against each other. Let them cross the box in a diagonal line, and in a vertical position. Decorate the openings in the side of this box with four oval frames and transparent glasses, and cover each with a curtain so contrived that all draw up together.
Place four persons (in the case first mentioned two are confederates) in front of the four sides, and at equal distances from the box, and then draw them up that they may see themselves in the mirrors, when each of them, instead of his own figure, will see that of the person next to him, but who will appear to him to be placed on the opposite side. Their confusion will be the greater, as it will be very difficult, if not impossible, for them to discover the mirrors concealed in the box. The reason is that though the rays of light may be turned aside by a mirror, yet they always appear to proceed in right lines.
Fig. 123.