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Bausch & L o m b Optical Co m p a n y permit the passage of the parallel beam of light straight through the dark chamber to the accessories for lantern slide or microscopical projection which are mounted on the optical bed in front of the dark chamber. This attachment, as described, is designed for use on the Convertible and Model D Balopticons. Apparatus for Projection of the Spectrum and Complementary Colors Figure 1—Showing Attachment Set Up on Either Model D or Convertible Balopticon. The projection of the spectrum and complementary colors is desirable in practically every physical or chemical department. We have designed for this work a set of accessories consisting of a supplementary bed attachable to any of our Balopticons fitted with the optical bed, an adjustable slit, carbon bisulphide prism and a set of lenses so that either the spectrum or complementary colors can be projected, as desired. 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 the front of the slit, while the latter is shown by introducing various chemi- cal salts into the arc. When projecting the spectrum, the adjustable slit shown at the extreme left, Figure 1, is clamped to the optical bed of the Balopticon in front of the slide carrier. The projection lens of the lantern, which should have a focal length of not more than 8 or 10 inches, is mounted in front of the slit. The other accessories are carried on the supplementary bed, which is attached to the lantern bed. These accessories consists of a 60° bottle prism, which is filled with carbon bisulphide 11 ^