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Section I.  OPTICAL TEST INSTRUMENTS
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Figure 10-4.  Dioptometer
TM 9-254 10-2. Projector Collimator - Continued Figure 10-2.  Projector Collimator Reticle 10-3. Collimating Telescope. a. Description.  The collimating telescope (fig. 10-3) is  a  small  straight  tube  telescope  containing  an  objective lens,  a  reticle,  and  an  eyelens.    The  outside  surface  of  the  telescope  is  carefully  machined  so  that  its  optical  and mechanical axes may be alined.  The telescope contains no erecting system, so when viewing through the telescope, a reverted, inverted image is seen upside down, with the right side on the left. b. Use.  The collimating telescope can be used to establish a horizontal or vertical line by means of its own reticle to test  instruments  for  field-of-view  tilt,  reticle  tilt,  and  diopter  scales  adjustments.    It  may  also  be  used  in  the  setup  and alinement of fire control test fixtures. 10-4. Dioptometer. a. Description.    The  dioptometer  (fig.  10-4)  is  a  calibrated  collimating  telescope.    It  has  a  conventional  type focusing eyepiece with an attached diopter scale, a stationary reticle pattern consisting of two lines crossing each other at right angles, and adjustable objective with a diopter scale and attached index.  The eyepiece diopter scale ranges from +4 to -4 diopters and the objective scale is graduated from +1 to -1 diopter. Change 2  10-2

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