Projection Apparatus (1917)

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Bausch & Lomb Optical Company Two 400-watt Mazda lamps are used, but due to the particular way in which they are connected up, there are never more than 400 watts drawn at one time, so that the apparatus requires only one lead of wire and can be connected to any regular lighting socket. In addition to this advantage the cutting off of the lamp when not required increases the length of service and materially reduces the heat. Specifications Base— Consists of front standard supporting projecting lenses, and sliding rods connecting with lamp house. Lamp House— Of sheet metal, specially ventilated, with removable top for access to lamps; measures 7 x 9)4 x 10/4 in. Illuminant —Two 400-watt gas-filled Mazda lamps with glass reflectors; connected with dissolving switch. Condensing System —Two regular double systems, 4)4 in. diameter, in special ventilated mount from which lenses can be easily removed for cleaning. Slide Carrier Permanently fastened in front of condensing system, with grooves for either American or English size of slide. Bellows —Mounted on metal frames which slide in metal ways. Projection Lens —Two of our regular Balo lenses, either 1)4 in. diameter or 2%6 in. diameter, as desired. Dimensions— Length (ready for projection with 15-in. focus lenses) over all, 26/4 in. Weight Complete in case with 2 5 /ie in. diameter lenses, 30 lbs. Case Sheet metal, 15)4 x 10>4 x 10)4 in., lacquered in black; with hinged side door, two catches and carrying strap. 26