TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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— CONTINUED TM 9-2350-311-10 2-11 OPERATION OF FIRE CONTROL EQUIPMENT UNDER NORMAL CONDITIONS 2-11.2 M118A2/M118A3 Elbow Telescope and M148 Telescope Mount — Continued c. Operation of M118A2/M118A3 Elbow Telescope and M148 Telescope Mount — Continued 3 4 5 6 NOTE Eyepiece arm will automatically lock within 50 mils. Depress lock-release lever (5) to adjust eyepiece arm (20). NOTE The field of view may look tilted because reticle and target will only appear level when angle of eyepiece and elevation angle coincide exactly. The apparent tilt does not affect accuracy and may be lessened by moving eyepiece arm. Look through eyepiece (21) and turn variable resistor knob (6) to adjust reticle (22) illumination. Level assembly mirror (8) is used to view level vial (7). Turn wormshaft assembly knob (10) until bubble is centered in level vial (7). 2-145