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30 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., IT. 8. A. have the appearance of moving clouds or figures. The middle lantern has a mechanical movement slide carrier, by means of which, figures, etc., are made to move across the screen, and have the appearance of passing through moving clouds. The lower lantern has an instantaneous shutter in front of the lens, worked by means of an air-bulb. With this device, lightning can be flashed on the screen and produce with the cloud effects a perfect representation of a storm By the aid of the triple key, the light of each lantern can be controlled at will; all three jets can be lighted at once, one or more gradually turned up or down, or suddenly flashed on the screen. By means of a peculiarly constructed diaphragm in front of the two upper lenses, a beau- tiful blending effect can be produced, and the clouds near the edge of screen are so blended that there is no sharp line of light, and figures, thrown on the screen apparently come out of dense clouds and pass off, in the same manner. The lenses are achromatic, of special construction, with so short a focus they will cover a screen forty-six feet wide, when the instrument is placed at a distance of 36 feet. This can be done at an angle of 45 degrees, which allows the instrument to be used back of the flies of a theater stage. We believe this is the first instrument ever made to do this work and to produce these effects. Not only the effects described above, but a great variety can be produced by this combination. This Stereopticon can also be used for producing effects obtained by such lecturers as Stoddard, Philip Phillips, Ragan and others. Each lantern has mechanical plat- inum tipped jets, triple four and one-half inch condensing lenses, and special achromatic objectives, or magnifying lenses. The tubes holding the lenses and condensers are of brass, finely lacquered. The body of the Stereopticon, triple-key, etc., are all finely nickel-plated. The price of this instrument complete, as described, in case, $500.00.