Projection Apparatus (1917)

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Bausch & Lomb Optical Company A rectangular mirror, which is attached to the rear (base) end of the microscope by a hinge^ joint, lies on the bottom of the dark chamber when the instrument is in the horizontal position, but when the microscope is swung into the vertical position it draws the mirror up to an angle of 45°, where it forms the base (hypothenuse) of the prism-shaped box. The mount- ing of this mirror drops into a small slot and locks the microscope in the vertical position. The purpose of the mirror is, of course, to reflect the light up through the microscope when the latter is in the vertical position. h or the low power objectives a first surface mirror, two inches wide, directs the beam of light toward the screen. For the higher powers with which an eyepiece is used a small prism over the eyepiece takes the place of the first surface mirror. The prism is so mounted that it can be quickly swung out of the path of light when the instru- ment is returned to the horizontal position. The eyepieces with prism and first surface mirror are all carried on a revolving plate for quick interchange, as described under the Horizontal Type. The Combined Horizontal and Vertical Type of microscope is carried on two lateral rods which are fastened to a frame and rigidly clamped to the optical bed in front of the slide carrier support. A projection lens with adapter is also mounted on the two lateral rods side by side with the microscope attachment. The projection of microscope slides or lantern slides is accomplished by sliding one or the other attachment into position. Ill