Projection Apparatus (1917)

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Bausch & Lomb Optical Company Special Traveling Outfits The use of the stereopticon is constantly increasing among institute workers, county agriculturalists and others who travel about delivering lectures — in which ■class may be included salesmen of machinery and similar non-portable articles, as well as promoters of educational campaigns in the industrial field. The Model B Balopticon naturally appeals for such use be- cause of its compactness, light weight and simplicity of operation. We have designed a special carrying case of wood covered with black lealheret and provided with metal corners and locks (Figure 3). Space is provided for the Model B with Mazda lamp also compartments for an extra Mazda bulb and for an acetylene burner, the holder of which will interchange with that on the Mazda lamp. As a source of sup- Figure 3—Special Portable Model B Balopticon pjy f or acetylene burner we re- BMP m Case. commend the acetylene gas tanks, as used on automobiles. If one does not wish to carry the tanks about, they can be rented in almost any locality where a lantern would be used. The Model B with the two forms of illuminant in the special carrying case has proved very popular. The outfit in its case weighs 20 pounds, and the latter measures 22x 20/4 x 7^4 inches NOTE — We are listing with this outfit the 10-inch focus lens, which is the one generally required. The 12 or 15-inch focus lens can be supplied at the same price. If one of these is preferred, substitute “12 or 15’’ for the numeral “10” in the above catalog numbers. We recommend that an extra Mazda lamp be included in traveling outfits to guard against possible breakage or burning out. The 250-watt Mazda with clear globe is $3.00 net. 23