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TM-9-1240-401-34&P Technical Manual for M109 Telescopes and Mounts Download

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5-54 TM 9-1240-401-34&P 5-26. M117/M117A2 PANORAMIC TELESCOPE FINAL INSPECTION AND ADJUSTMENT - continued I g. PARALLELISM OF RETICLE AND IMAGE 1 Rotate azimuth knob (1) until reticle line of M117/M117A2 panoramic telescope (2) coincides with reticle line of collimating projector (3). 2 Check image tilt through two full revolutions of the cap assembly. The image of a vertical target line shall be vertical within 0.62 mils or 2° of arc over the full field of view of the dioptometer (4). h. PLUMB TRAVEL AND LINE OF SIGHT TRAVEL 1 Collimate M117/M117A2 panoramic telescope (ref. para 5-26c). 2 Suspend plumb line (1) to one side of azimuth test- ing fixture (2). 3 Rotate azimuth knob (3) to sight onto plumb line (1). 4 Install a parallax shield on M117/M117A2 pano- ramic telescope eyepiece (4). 5 Place a mark on wall behind plumb line (1), inter- secting reticle line.