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Figure 10-8.  Equipment for Telescope Test Fixture
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Universal Vibration Tester
TM 9-254 10-8. Cross Leveling Fixture. a. Description.  The cross leveling fixture (fig. 10-9) is made from heavy components, mainly cast iron, to reduce vibration  and  maintain  accurate  angular  settings.    Two  large  circular  scales,  graduated  in  degrees,  form  part  of  the elevation and cross leveling mechanisms of the fixture.  The axes of these mechanisms lie in a horizontal plane and are fixed at right angles to each other.  Each mechanism may be displaced independently upward or downward by means of worm and wormwheel movements actuated by the handwheel.  Angular settings of either mechanism may be refined to minutes of arc by means of the vernier scales which form the indexes for the circular scales. b. Use.    The  cross  level  fixture  is  used  for  the  adjustment  and  inspection  of  various  fire  control  mounts  and quadrants such as the M21A1 Telescope Mount, M145 Telescope Mount, and the M15 Elevation Quadrant.  The fixture was  designed  for  checking  the  accuracy  of  elevation  mechanisms,  angle-of-sight  mechanisms,  and  the  setting  of  level vials. Figure 10-9.  Cross Leveling Fixture. 10-8

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