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Bausch & Lomb Optical Company Special Dissolving Equipment For 5x7-Inch Plates This double dissolving equipment is of the very highest order, offering the widest and most convenient range of adjustments possible. It is designed primarily for the projection of 5 x 7 autochrome plates. The lanterns are mounted on optical beds of the lathe type, which will accommodate projection lenses up to 42 inches equivalent focus. The lamp houses and standards are adjustable along these beds and are clamped in position by strong clamps. All instruments of this type have thus far been made of aluminum throughout, being used as traveling outfits, and the use of this metal, of course, greatly increases the cost of the apparatus. This Special Dissolving Equipment is made to order only. Specifications Base —Consists of two supports of 26-in. lateral spread with pillars carrying the lower optical bed, and with arms supporting the upper bed, 9 in. above and 15 in. to the left of the first; front pillar adjustable for height by long range screw operated by wheel, 10 in. in diam., and with clamping lever for rigidity, permits adjustment for use on floor or in gallery of auditorium; special braces at front and rear give proper rigidity; feet provided with castors and leveling screws. Optical Beds —Length, 59 in., accommodating lenses up to 42 in. E. F.; accurately milled and of large cross section; provided with accurate adjust- ment for securing coincidence of pictures on screen; height of lower bed from floor, 44 in. Lamp Houses Measure 13/4 in. long, 15 in. high and 8 in. wide; light-tight and freely ventilated; constructed of double sheet metal walls with an air space between the two walls and the roofs fitted wfith our special patented ventilator; provided with large, light-tight, spring doors on side and observation windows on both sides; conform to most rigorous requirements of Boards of Underwriters. Illuminants —Hand-feed arc lamps for direct or alternating current, connected by two feed wires to a switch attached to rear of base and provided with magnetic coils to minimize blowing ; or 1000-watt, gas-filled, Mazda stereopticon lamps. Condensing Systems —Our triple systems in patent, ventilated mount with lenses 8 in. in diam. Slide Carriers —Two sets of carriers for 5x 7-in. plates, one taking the slide the long way vertically, the other the long way horizontally; carriers for special sizes made to order. Bellows —Mounted on metal frames which slide in metal ways; provided with supports to prevent sagging. Projection Lenses —Our Balo series lenses of 40-in. focus, 4-in. diam., in rack and pinion focusing mounts; other focal lengths can be supplied. Iris Dissolver —Our patented iris dissolver with 4-in. diaphragm openings. Prices quoted on request. 89