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Bausch & Lomb Optical Company Accessories for Projection of Cells and Tubes Figure 6—Accessories for Projecting Cells and Tubes with Universal Balopticon. This set of accessories is designed for use in the chemical and physical laboratories for projecting any demonstrations which may be conducted with the aid of cells, test-tubes, thermometers, etc. It consists of a 4/4-inch condensing lens with adapter, which is substituted for the projection lens for opaque objects, a separate optical bed on support and a standard upon which is mounted the pro- jecting lens regularly used for lantern slides. The apparatus to be projected is carried directly in front of the condensing lens on one of the supports or standards to be found in every laboratory. With this arrangement unlimited space is provided for placing in position of cells, burrettes, cylinders, etc., as may be required for showing the phenomena desired. When this apparatus is to be used, a table with extra long top is required to accommodate the projection lens and its optical bed. For this purpose we recom- mend our Balopticon Table No. 4253B. (See "Accessories”.) In order that the image may not be inverted we recommend the use of the special erecting prism No. 4441, which fits over the front of the projecting lens. If one is satisfied with the smaller (3-inch) beam of light obtained with the opaque object projection lens, this lens may be used and the cost of the extra condensing lens saved. Moving Picture Projection The special stand illustrated in Figure 7, permits the projection of moving pictures and affords instant interchange between this and the other forms of pro- jection. The Balopticon is carried on two lateral tracks upon which it can be moved from one side of the stand to the other. The supplementary optical bed, otherwise attached to the base of the instrument when it is desired to accommo- date a microscope or other attachments, is carried on supports beside the moving Picture mechanism. This bed carries all accessories regularly accommodated by the Universal. When changing from moving pictures to any other form of projection, the Balopticon is simply slid over until it lines with the supplementary optical bed, and vice versa. ->3