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Bausch & Lomb Optical Company Figure 1—Simplified Micro-Projection Apparatus, Showing Large Projection Microscope Mounted on Optical Bed. If it is desired to project objects which must be maintained in a horizontal position on the stage, our Combined Horizontal and Vertical type of projec- tion microscope is recommended. While the projection microscope should be used for the best results with objectives of widely varying powers, highly satisfactory results will be obtained with the regular compound microscope, especially when using the medium power objectives such as the 16, 8 and 4 mm. To accommodate the regular microscope a plate can be supplied which attaches to the optical bed and is pro- vided with a clamp for holding the microscope. Figure 2—Simplified Illuminating Apparatus, Showing Accessories for Projection of Spectrum and Complementary Colors, Mounted on Optical Bed. The arc lamp has sufficient latitude of adjustment to permit the microscope to be used in the vertical position when working with fluid preparations. In this position it is, of course, necessary to place a reflecting prism or mirror over the eyepiece to direct the light toward the screen. A suitable diaphragm is included with each outfit to prevent the extraneous light from reaching the screen. In the case of the outfits using a laboratory microscope this diaphragm is placed back of the microscope, as illustrated in Figure 3. The regular Abbe condenser works very well with the higher power objec- tives, but for the 16 mm and lower powers the upper portion of this condenser should be removed in order to obtain a properly lighted field. This simple apparatus also furnishes an excellent illuminant for the set of accessories used in the projection of the spectrum, absorption spectra and comple- mentary colors, since it projects upon the slit an exceptionally well defined image of the arc. See “Accessories.” This outfit is illustrated in Figure 2. 84