16
3. Checking of i Angle
∙ Set up the instrument at a point half-
way between points A and B, the dis-
tance between staff A and staff B is
about 50m. Take reading a1 and b1.
(See fig. 8)
∙ Set up the instrument at a point 2m
from point A. Take the reading a2 and
b2.
(See fig. 9)
∙ Calculate: b2’ = a2 − (a1 − b1), If b2’
= b2, it means that the instrument is
workable, otherwise adjust the instru-
ment as follows:
∙ Unscrew and remove the cover for
the reticle adjusting screw.
(See fig.
10)
∙ Use the adjusting pin to adjust the
position of the cross line of reticle,
if b2’ < b2, adjust downwards, oth-
erwise, adjust upwards.
(See fig. 11)
∙ Repeat the adjustment until b2’ =
b2 or the difference is smaller than
4mm.
Fig. 8:
Fig. 9:
Fig. 10:
Fig. 11:
Summary of Contents for EAGLE 24
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