3. At eye-level and arms length, position the compass on its side with the clinometer scale
(reference card 1) facing you and down.
4. Sight object behind the compass
(figure 36).
· Align the side of the compass with
the object.
5. On the clinometer card, read
inclination at the end of the
green
clinometer arrow - 40°.
11.2.b -- Sight Hole Sighting
1. Make sure the 5° clinometer,
reference card 1, is centered in the vial.
2. Open sight cover to 45°.
3. Position compass at eye-level with the
mirror extending outward to the left.
4. Above or below the horizon, sight an object
through sight hole (figure 37).
· Align cover line and the sight cover line.
5. Read inclination in the mirror, on reference
card - 40° (figure 37).
11.3 1 Degree Graduated Dial Clinometer
The 1° graduated dial clinometer is the most accurate means of sighting inclination. The
resolution of the graduated dial is 1°. Use this method to sight up from the horizon (0°) to
overhead (90°), or from the horizon downward.
11.3.a -- Up Angle
1. Remove rubber shoe to expose back side
of compass.
2. Locate the clinometer index mark on the
back side of the azimuth ring.
3. Holding black azimuth ring stationary,
rotate vial until the arrow on the
blue
orienting circle points to the clinometer
index mark (figure 38).
20
Figure 36
Figure 38
Figure 37
Cover Line
Sight Cover Line
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