TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9-2350-311-10 2–11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS — CONTINUED 2-11.1 M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount — Continued b. Description of M117/M117A2 Panoramic Telescope and M145/M145A1 Telescope Mount Components — Continued 22 Elevation knob (24) adjusts reticle up or down 300 mils when turned. 23 Quadrant seat (25) allows M1A1 gunner’s quadrant to be positioned for fine elevation adjustment. 24 Variable resistor knob (26) varies amount of light for reticle pattern when turned. 2-137