ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
j. If DA and RA differ by more than 0.1 mil, check
Verify the telescope is properly pointed on the
the plumb and level of the theodolite and target
target and record the horizontal circle reading
and remeasure the angles, If there is a consistent
(0.158 mil).
error, adjust the instrument in accordance with
With the telescope in the direct (D) position,
turn it in a clockwise direction and autoreflect
k. Mean DA and RA to obtain the horizontal angle
on the porro prism. Record the horizontal circle
(HA).
reading (824.376 mils).
824.218
Plunge the telescope to the reverse (R) (sight on
+824.216
bottom) position.
1648.434
2
Autoreflect on the porro prism and record the
HA = 824.217
horizontal circle reading (4024.372).
With the telescope in the reverse (R) position,
are completed at a station, the theodolite and tripod are
point on the azimuth target, Record the horizon-
taken down as follows:
tal circle reading (3200.156).
a. Place the telescope in a vertical position with
Subtract the direct reading on the target from
the objective lens down and tighten the vertical
the direct reading on the porro prism to obtain
clamping screw.
the direct angle (DA).
b. Turn each leveling screw to the same height.
824,376
c. Position the horizontal clamping screw directly
-0.158
over one of the leveling screws and tighten it.
DA = 824.218
d. Grasp the instrument by its right standard and
unscrew the instrument-fixing screw. Lift th
Subtract the reverse reading on the target from
theodolite from the tripod and secure it in the
the reverse readin on the porro prism to obtain
carrying case. Replace the dome-shaped cover.
the reverse angle (RA).
e. Replace the tripod head cover. collapse the tri-
4024.372
pd, and strap the tripod legs together.
-3200,156
RA = 824.216
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