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Bausch & L cf m b Optical Company Figure 1—Large Projection Microscope, Horizontal Type. Large Projection Microscopes Horizontal Type Our Large Projection Microscope of the regular Horizontal Type, Figure 1, is carried on a swinging arm, as it has been in the past, so that quick interchange can be made between microscopical projection and that of lantern slides. The Substage Conden- sers —three in number—are adjustable for focus by rack and pinion. A condenser, 72 mm in diameter, is supplied for use with low power objectives, such as the 72, 48 and 32 mm Micro-Tessars. The 72 mm condenser works equally well with all three of these objectives, when the focal point is adjusted to meet a change of powers. For higher powers the instrument is equipped with two condensers of 0.50 and 0.85 N. A., respectively, the former for 16 and 8 mm objectives, the latter for 4 mm and shorter focus objectives. These two condensers are used in conjunction with the 72 mm condenser. They are mounted on a revolving nosepiece which can be swung to one side, thus giving quick interchange or permitting both to be turned away from the optical axis. I he stage of the microscope is provided with a U-shaped plate in which is inserted a water cell with an opening of 24 mm. This water cell is flush with the stage surface and consequently comes into direct contact with the slide, which it cools by absorption, thus allowing one to leave seasoned slides in position for any length of time without danger of melting the mounting medium. If desired, this water cell can be used with all objectives, from the 72 mm Micro-1 essar to the 3 mm objectives, although the opening is not large enough to permit the entire available field of the 32, 48 and 72 mm Micro-Tessars to be utilized. For this reason we supply a second U-shaped plate with aperture of 54 mm, which can be substituted for the other. This latter plate is, of course, without water cell, since none is required with low powers as the image of the arc does not fall near the object. The objectives are mounted on a regular triple nosepiece when the equipment consists of the usual microscope objectives, such as the 32, 16 and 8 mm; but if lower powers, such as the 48 and 72 mm Micro-Tessars, are to be used, we recommend that the microscope be equipped with the large revolving plate as shown in Figures 2 and 3, permitting instant interchange of six different objectives. The body tube is of large diameter (63 mm inside) to allow for the projec- tion of the full available field of the Micro-Tessars. Fitted to the outer end of the body tube is a revolving plate with two extension tubes for eyepieces and two other openings, the latter being 63 mm in diameter. In projecting with the Micro- 1 essar lenses the eyepiece should be turned aside and the light allowed to pass 109