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Bausch & Lomb Optical Company makes it possible to project areas up to 8 inches in diameter, Figure 6. It is arranged to be fitted on the optical bed directly before the main dark chamber, the front of which is removed to permit the full 8-inch diameter beam of light to enter the attachment. A movable mirror in the secondary dark chamber reflects the light upward, where it is collected by a large plano-convex condensing lens placed in a horizontal mount on the top of the secondary chamber. Around this condensing lens is con- structed a cloth-covered platform, on which the transparency may be placed. This permits the specimen to be shifted so that any particular area can be projected. The projection lens and reversing mirror are mounted on a swinging arm so that they can be readily turned out of the path of light for the projection of opaque objects. Spectroscopical Projection Figure 9—Set of Accessories for Projection of the Spectrum and Complementary Colors. The set of accessories for projection of the spectrum and complementary colors is very readily manipulated. The apparatus consists of a supplementary bed attachable to the optical bed, an adjustable slit, carbon bisulphide prism and a set of lenses with which either the spectrum or complementary colors can be projected, Figure 9. Both absorption and emission spectra can be shown with this attachment, the former being demonstrated by simply placing the absorbing media in the path of light in front of the slit, while the latter is shown by introducing various chemical salts into the arc. Special revolving carbon holders which can be fitted to the arc lamp are recommended so that new carbons can be used with each new salt, thus securing a pure spectrum in each case. Moving Picture Projection We have designed the special stand with fittings, as shown in Figure 10, to provide an efficient means of projecting moving pictures in connection with the opaque object, lantern slide and other forms of projection available with the Con- vertible Balopticon. Two tracks running from side to side across the top of the stand support the Balopticon. On one front corner of the stand is a supplementary table carrying the moving picture attachment (either Edison, Powers or Simplex). The optical bed which is ordinarily attached to the front of the base of the Con- vertible is, with this arrangement, carried by two supports mounted on the table top and is independent of the Balopticon. All of the accessories, such as the projection microscope, etc., that would be used on any regular Convertible can be attached to this bed. 78