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MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL. U. S. A. 27 for the illumination of the hall, or theater, or church at the close of an entertainment where they have no electric light, or cannot light their gas by electricity. In an instant when showing the last picture or the “ Good Night ” chromatrope, you can dissolve right over on this third light, and the hall is bril- liantly illuminated so that the audience can readily disperse. Each door is provided with a blue glass window, so that the condition of the light can always be ascertained without injury to the eyes by looking directly into the powerful incandes- cent lime. The dissolving key furnished with this instrument is of the latest improved pattern, having the new Off-flow Regulat- ing Needle Valves, for the establishment of the off-flow of hydro- gen. No rubber tubing is used inside of the lantern. From either side of the mixing chambers a tube of brass passes back- ward and out of the lantern body. In lieu of having stop-cocks affixed to each tube as in the ordinary manner, separate blocks with needle-valve attachment, are placed on the back of the lan- tern to which the tubes are attached by short pieces of rubber hose. One feature of these attachments is that you may estab- lish your equilibrium of gases and have your lantern all arranged for work several hours before the entertainment, and by means of these valves you can shut off the supply of gas without dis- turbing the needle-valves, so t-hat when you light up in the evening you can do so instantly, and yet have a perfect equilib- rium established. The jets are both mechanical, whereby the raising and lowering, and moving from right to left or vice versa, and forward and backward movements are all controlled by several milled-head screw movements. This lantern is provided with first-quality Plano Convex Condensing Lenses, four and one-half inches in diameter, mounted in brass fronts so that they can be removed easily for the purpose of cleaning, or if one should become broken through an accident, it can be quickly and easily replaced without disturbing the entertainment. The objectives or magnifying glasses are achromatic and free from chromatic or spherical aberration. Of long focal length, they have two magnifying powers, controlled by the finest rack and pinion focusing movement. The lime carriers are also mechan- ical, since you can raise or lower, or turn from right to left by a milled-head screw on the back of the lantern. Both fronts are of solid brass, removable at will. The upper front can be revolved so that all mechanical slides that have a vertical move-