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Bausch & Lomb Optical Company Lamp House —Two styles, small and large, both of sheet metal, fitted with our special, patent, light-tight ventilator and provided with two observation windows; small style measures 6)4 in. long, 11 in. high and 6 in. wide, asbes- tos lined; large style measures 13J4 in. long, 15 in. high and 7/4 in. wide, light-tight, constructed of double walls with air space between and provided with large light-tight door on the side— conforms to the most rigorous requirements of Boards of Underwriters. Illuminant —Hand-feed arc lamp for direct or alternating current. Condensing System —Our triple system in patent, ventilated mount; provided with water cooling cell; diameter, 4/4 in. * Slide Carrier —Our double carrier, No. 4430, with elevating device. Bellows —Mounted on metal frames which slide in metal ways. Projection Lens —Our Balo lens with rack and pinion adjustment. Dimensions —Length, extended, 32 in. without lens; height, 11 % in. or 15 in. Case —Regularly furnished only with small lamp house (see foot note under price list); strongly built of wood, measuring 33 x 13/4 x 8)4 in. and provided with iron handle; fitted with strong spring catches and locks. *The quick-changing slide carrier, No. 4449, giving a dissolving effect, may be sub- stituted for $1.50 extra. *The 25-inch optical bed supplied with this outfit will accommodate lenses up to 22 inches in focus. If 20 or 22-inch focus lenses are required, substitute “20” or “22” for the numeral “18” in the above catalog number. No additional charge is made for the longer focus. A carrying case is not regularly supplied with the large lamp house. For those outfits we can supply a special wooden case for $4.00 additional. If any of the above Balopticons is desired with some lamp other than the hand-feed arc, deduct the price of the latter, $10.00, and add price of illuminant desired (see “Accessories”). 39