Projection Apparatus (1917)

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Bausch & Lomb Optical Company Special Accessories for Projection of Chemical and Physical Demonstrations Figure 9—Accessories for Projecting Chemical and Physical Demonstrations with Model D Balopticon. In teaching chemistry and physics it is frequently desirable to project an experiment on the screen or to demonstrate various phenomena, such as electrolysis, precipitation, etc., before the entire class. This can best be done by placing the necessary cells, cylinders, thermometers, or whatever is required in the optical axis of a projection lantern. Since these pieces of apparatus are often of such size and shape that they cannot be adapted to the regular lantern, we supply special standards to support the lamp house and accessories of the Model D. These give almost unlimited space for the introduction of demonstration apparatus. One standard with a short section of optical bed supports the lamp house, water cell and slide carrier support. The other standard with a long section of optical bed supports the standard with projection lens. The apparatus used in the demonstration is supported between these two sections of optical bed upon the supports which are found in any labora- tory. The two standards with sections of optical bed are required in addition to the regular lantern bed. 45