Projection Apparatus (1917)

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Bausch & Lomb Optical Company through one of these large openings. The other opening is provided so that a mirror can be mounted on the plate for directing the light to the screen when using the vertical microscope, Figure 3, or when it is desired to direct the beam of light onto a drawing board. This mirror is used m connection with the Micro-Tessars only. The microscope is focused approximately by rack and pinion; fine focusing is accomplished by a side fine adjustment of our lever type, which eliminates any possibility of lost motion. Combined Horizontal and Vertical Type To supply an apparatus with which microscopic objects can be projected while being held.in a horizonta 1 plane we have designed this new type of our Large Projection Microscope. Thus objects in liquid or substances in a more or less liquid state can be projected with the microscope in the vertical position, while objects which do not have to be held in a horizontal plane can be projected with the instrument swung into its horizontal position. The microscope itself is the same instrument as the one described under the Horizontal Type, but is mounted in connection with a small dark chamber. When the microscope is in the horizontal position, the light passes straight through this dark chamber to the microscope, Figure 2, but when the instrument is swung into the vertical position it draws out of the dark chamber the prism-shaped box upon which it stands, Figure 3. 110 Figure 2—Large Projection Microscope, Combined Horizontal and Vertical Type, in Horizontal Position.