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Bausch & Lomb Optical Company Specifications Base—Of cast iron, 25 in. in length; carried at height of 7 in. from table by two cast iron supports of 11-in. spread with elevating screws front and rear. Lamp House —Measures 13/£ in. long, 13/4 in. high and 7/4 in. wide; light- tight and freely ventilated, constructed of double sheet metal walls, with an air space between the two walls and the roof fitted with our special patented ventilator; provided with large, light-tight spring door on the side and obser- vation windows on both sides; mounted between uprights at front end and provided with handle at rear, permitting it to be easily tilted for opaque projec- tion and held rigidly in position by strong spring arm; conforms to the most rigorous requirements of Boards of Underwriters. Illuminant —Hand-feed arc lamp for direct or alternating current. Condensing System —Consists of two rear lenses of our triple system, 6-in. diameter, in ventilated mount direcdy in front of lamp house, rendering light approximately parallel in dark chamber, and a piano convex lens placed in front of the mirror box for lantern slide work, completing triple system. Object Holder —Round, of heavy metal, mounted on double arm with spring hinge at each end and handle at holder end; the whole adjustable for height on a grooved vertical standard and provided with set screw; will accommodate objects of widely varying thickness and size, the holder always remaining parallel to base and automatically bringing object into proper plane of projec- tion; dark curtain in front of opening prevents light from flooding room when object is being changed. Slide Carrier —Quick changing slide carrier so arranged that the slides can all be inserted from one side. Post Card Carrier —Two adjustable holders with wooden backs and frame which fits securely over opening in bottom of dark chamber. Projection Lenses —Two of our Standard lenses with rack and pinion focusing adjustment, that for lantern slides regularly of 8-inch focus, ljHs-in. diameter, and that for opaque work of 15-inch focus, 4-in. diameter; lenses of other foci may be substituted if so specified. Dimensions —Length over all, 38 in.; height, 24 in. Vertical Equipment —Regularly furnished with Universal Balopticon No. 4186 only, but can be ordered separately and easily added to No. 4185; consists of a rectangular metal plate, 6 % x 12 in., with circular opening at either end; over one end is mounted a piano convex condensing lens with plane side up, to complete triple condensing system for vertical projection and provide stage upon which to work; upright grooved standard near opening carries 10-in. focus, 1 ;14-in. diameter projection lens and mirror for vertical work; over other open- ing provision is made for mounting mirror box with lantern slide equipment; for quick transformation from one form of projection to the other entire plate slides on metal rods and is operated by convenient handle. 65