Projection Apparatus (1917)

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Bausch & Lomb Optical Company Figure 2—Combination Home Balopticon for the Projection of Both Opaque Objects and Lantern Slides. illumination exceeding considerably that obtained from a 5-ampere arc lamp. It can be attached to any convenient lamp socket, requires no rheostat and is entirely automatic. An aluminum screen, which greatly increases the brilliancy of the image, is included with each outfit. Specifications Base —Consists of front metal standard and metal feet at rear of dark chamber. Dark Chamber— Of sheet metal, 13>^x9^x7 in., light-tight and well ventilated; has convenient door on right side and opening in bottom, 5x5 Vz in., for pic- tures and objects; contains fixed mirror and adjustable shield, which is swung to horizontal position when lantern slides are projected. Illuminant 400-watt, gas-filled, Mazda stereopticon lamp mounted in connection with specially corrected glass reflector in compact metal casing attached to rear of lamp house; furnished with 15 feet of cord, plug and switch. Projection Lens —Achromatic construction, of 4-in. diameter, 13-in. focus; mounted in well constructed spiral focusing metal tube; gives image about 4 ft. wide at projection distance of 12 ft. Object Holder —Actuated by strong spring arm and always occupies horizontal position; supplied with two adjustable post card holders, with wooden mar- gins, light and conveniently manipulated. Screen —Aluminum coated, 54 in. square; mounted on plain roller. Lantern Slide Equipment —Attached to lantern body beneath large projection lens in combination model, BRMS; consists of double condensing system, double slide carrier, No. 4430, bellows and front standard carrying a smaller achromatic projection lens, in spiral focusing mount, which gives pictures from slides correspond ing in size to those from opaque obj ects; front standard attached to sliding rods which aid in focusing; convenient lever shifts shield to change from one kind of projection to the other. Dimensions —Length (ready for operation)—simple model, 15 in., combination model, 24 in.; height, 15 in.; width, 7 in. 48