14
get the bubble in the center of the
circular level by adjusting the circu-
lar level adjust-screw with the hex-
agonal wrench. Repeat the above
checking and adjusting, until the
bubble does not shift when the in-
strument turns to any direction.
(See
fig.7)
1. leveling screw
2. bubble adjusting
2. Checking of the compensator
∙ Center the bubble in the circular lev-
el, and aim the telescope at a target
about 70m away.
∙ Turning the leveling screws to make
the bubble slide out about 1/4 of the
circular to any direction, if there is no
deviation between the image of target
and the horizontal cross-lines, it means
that the working range and the pre-
cision of the compensator are stable.
This checking must be done before
surveying.
Fig. 7:
1
2
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