TM-9-6675-262-10
AIMING CIRCLE M2 W/E AND M2A2 W/E
TECHNICAL MANUAL; OPERATOR MANUAL
DECEMBER 2013
TM-9-6675-262-10 - Page 40 of 68
0005-8
LEVELING AIMING CIRCLE
NOTE
For general use of Aiming Circle, such as laying artillery and mortars, centering the
bubble in the circular level provides sufficient accuracy.
If more accurate leveling is
required, such as survey work, the main housing tube level bubble must be centered.
1.
Turn Aiming Circle leveling screw knobs (Figure 8, Item 1) until the
bubble is centered in the circular level (Figure 8, Item 2).
2.
Check that circular level bubble stays centered while fast traversing the
Aiming Circle through 6400 mils.
Spot check at 1600-mil intervals that
bubble is centered.
3.
If circular level bubble does not stay centered, repeat Steps 1 and 2.
4.
Uncover main housing tube level (Figure 8, Item 3).
Adjust leveling
screw knobs until bubble in main housing tube level (Figure 8, Item 3) is
centered.
5.
Turn Aiming Circle in azimuth and watch the bubble in the main housing
tube level (Figure 8, Item 3).
The bubble must stay centered while the
Aiming Circle is turned through 6400 mils.
Spot check at 1600-mil
intervals.
6.
If the bubble in the main housing tube level (Figure 8, Item 3) does not
stay centered, turn leveling screw knobs (Figure 8, Item 1) to center
bubble in main housing tube level (Figure 8, Item 3).
7.
Turn Aiming Circle in azimuth to another azimuth setting.
Again, turn
leveling screw knobs (Figure 8, Item 1) to center bubble in main housing
tube level (Figure 8, Item 3).
8.
Repeat the turning of the Aiming Circle in azimuth and the turning of the
leveling screw knobs (Figure 8, Item 1), as necessary.
9.
The main housing tube level bubble must remain centered while the
Aiming Circle is turned through 6400 mils.
Spot check at 1600-mil
intervals.
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