ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
e. Read the horizontal circle. The reading should
NOTE
be 0.150 (within 0.100 roil), With care, a circle
To increase visibility, color the theodolite
may be set to an accuracy of 0.010 mil.
sight white with typewriter correction
fluid. At night, illuminate the sight with
the theodolite handlamp.
a. Release the horizontal and vertical clamping
a. Level the porro prism using the level adjust
screws.
knob and level vial. The level adjustment can
b. Aim the telescope on the target. Focus as neces-
accommodate slopes up to 20 degrees.
sary.
b. Aim the theodolite so the horizontal crosshair
c. When the telescope crosshairs are on the target,
lies along the centerline of the prism.
tighten the horizontal and vertical clamping
c. Increase the telescope focus towards infinity un-
screws.
til the reflected image of the front of the tele-
d Use the telescope focusing ring to bring the
scope is visible.
image into sharp focus.
d Adiust the theodolite so the reflected image of
e. Use the horizontal and vertical tangent screws to
the theodolite sight is centered on the vertical
exactly center the intersection of the horizontal
crosshair. See figure 5-5. Lock the clamping
and vertical crosshairs over the target. If the
screws and readjust as necessary.
target is a vertical line, like a pole, the same
point on the target must be used for each sight-
ing.
a. With the telescope in the direct (D) (sight on
top) position, point the telescope on the azimuth
target.
b. Set the horizontal circle to approximately 0.150
roil.
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