TM 9--2350--292--10
TOW DISABLED VEHICLE -- CONTINUED
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DESCRIPTION OF SURVEYING LEVEL
The surveying level is an instrument used for measuring slopes. The instrument consists of a square metal sighting
tube (1) on which an arc (2) is mounted with an index arm (3) holding a level vial (4). Inside tube (1), right of the
arc, is a mirror which reflects the image of bubble on level vial (4) to eye piece (5). A cross line (6) is mounted hori-
zontally inside sighting tube (1) and is used to align on the target. The leveling vial (4) is mounted on the index arm
(3) so that it can be rotated. The amount of rotation can be read on scale (7) of the arc (2) on index arm (3). Set-
ting knob (8) provides slow motion adjustment of index arm (3). The index arm thumb nut (9) can be tightened to
lock the index arm.
1
2
3
4
5
6
10
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9
8
MEASURING A SLOPE
WARNING
Do not exceed an uphill or downhill slope of 30 percent during any towing operations.
Failure to comply will result in possible serious injury or DEATH to personnel or dam-
age to equipment.
1. Using surveying level sight target by looking through eye piece (5) aligning cross line (6) (left side) on the
top of the slope if going uphill or the bottom of the slope if going downhill.
2. While sighting on target with cross line (6), move index arm (3) for coarse adjustments, or turn setting knob
(8) for slow motion adjustment until center level vial bubble (10) is aligned with cross line (6).
3. If necessary, lock index arm (3) by tightening thumb nut (9) and read slope percentage indicated by index
arm (3) on scale (7).
END OF TASK
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