TM 5-6675-270-15
nearly every job presents a different problem, the
operator may have to vary the given procedure
to fit the individual job.
2-9. Adjustments
a. Circular Level. Refer to figure 2-16 and ad-
just the circular level.
b. Plate Level.
(1) Level the theodolite (para 2-10).
(2) Refer to figure 2-17 and adjust the plate
level.
c. Optical Plummet.
(1) Set up the tripod and theodolite (para
2-2 b.)
(2) Place a cross or other distinctive mark
on the ground and center the instrument directly
over it. Observe this mark through the optical
plummet eyepiece and move the instrument until
the ground mark is in the exact center of the
microscope.
(3) Unlock the horizontal clamp and rotate
the U-frame 180". Lock the clamp. If the micro-
scope circle mark has moved, loosen the tripod
head bridge screw (fig. 2-11) and move the the-
odolite toward the ground mark one-half the
Figure 2-17. Plate level adjustment.
displacement.
(4) Refer to figure 2-18 and adjust the
optical plummet.
d. Collimation Slow-Motion Screw. Refer to
screw.
ure 2-21 and adjust the horizontal slow-motion
screw.
g. Compass.
(1) Level the theodolite (para 2-10).
(2) Install the compass (para 2-2b.).
(3) Refer to figure 2-22 and adjust the com-
pass.
h. Horizontal Collimation.
(1) Set up the tripod and theodolite (para
(2) Sight on a well defined object at a dis-
tance of about 300 feet, with the telescope as
nearly horizontal as possible.
(3) Observe and record the horizontal circle
reading through the microscope.
(4) Reverse the telescope to the opposite
horizontal position and rotate the U-frame to the
reverse position. Resight on the same object and
observe and record the reading.
Figure 2-16.
Circular level adjustments.
2-20
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