19
II
PREPARATION
For the model with centering leveling base
(1) Hang a hook for plumb bob line on
the V-shaped metal bracket inside
of the center of the instrument’s
base plate.
(2) Pass the hook for plumb bob line through the hole of the instrument
clamp screw. Place the instrument on the tripod head.
(3) Insert the instrument clamp screw into the center hole of the
instrument’s base plate and tighten.
(4) Hang the plumb line on the hook of the instrument clamp screw.
Adjust the length of the plumb line so that the tip of the plumb bob is
approximately level with the station point.
(5) Slightly loosen the instrument clamp screw. Supporting the outer
side of the leveling base with both hands, carefully slide the
instrument on the tripod head until the tip of the plumb bob
approximates the center of station point (±10mm). Tighten the
instrument clamp screw.
(6) Loosen the centering clamp and slide the instrument so that the tip of
the plumb bob coincides with the center of the station point.
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