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6.2 MEASURING HORIZONTAL ANGLE
The horizontal circle graduations are annotated every 10
°
(360
°
) or 10 gon (400 gon) in a clockwise direction. As a
result, sighting is performed from left to right.
1) Use the plumb bob
to set up the instrument directly
above the surveying point. (Fig.6.3)
Fig.6.3
2) Sight point A, and set the horizontal circle
to 0
°
by
turning the horizontal circle positioning ring
. (Fig.6.4)
Fig.6.4
3) Sight point B and take the angle reading.
Example: 91.5
°
(or 91.5 gon) in (Fig.6.5) below.
Fig.6.5
15
12
11
Содержание B20
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