8 Graduated circle
9 Circular bubble
10 Hole 5/8"
11 Horizontal circle reference mark
Instrument is equipped with one flat base (1), three setting
screws of the levelling (2) and a 5/8 hole to tighten it on the
tripod.
8
The automatic compensator keeps the optical axis strictly hori-
zontal within its operating range (usually in the circular bubble
range)
To correctly perform the operation it's necessary to let the level
bubble coming back inside the circle using the three setting screws.
The 360° graduated circle is steerable with the knobs (3).
Graduation over the circle must be read in correspondence of the
reference mark (11).