TM5-6675-296-14
e. installation.
(Models
T2-56-C-MIL,
d. Cleaning and Inspection. Brush all dirt, dust,
T 2 - 5 6 - M - M I L , T2-63MIL, T2-66-C-MIL and
and foreign matter from the tribrach components.
T2-67MIL).
Wipe all surfaces clean with a soft, lint-free,
( 1 ) Place the theodolite on the tribrach
moistened cloth. Thoroughly clean all bearing
assembly (fig. 4-27).
surfaces on which the tapered locking wedges ride.
(2) Push the lock lever upward and to the left
Inspect the tribrach, base plate, and spring plate
to engage locking lever.
for cracks, and breaks. Inspect the three leveling
f. Installation. (Model T2-68MIL).
screws for proper operation. They should turn
( 1 ) Place the theodolite on the tribrach
smoothly and evenly, yet require a moderate
assembly (fig. 4-28).
amount of force exerted by thumb and forefinger
(2) Turn tribrach lock knob clockwise and
t o turn without backlash. Lubricate bearing
tighten locking screw.
surfaces sparingly before reassembling the tribrach
assembly to the theodolite. Replace a defective
tribrach assembly.
Section Xl. MAINTENANCE OF ILLUMINATION MIRRORS
camel's hair brush it dusty, and with a chamois it
4-26. General
foggy. Inspect the hinge action for too-stiff or too-
The rotable illumination mirrors are used to reflect
Ioose movement. It should remain in the position
available natural light through the illuminating
where placed. Inspect the push-fit mirror mounting
prisms within the theodolites and onto the reading
for too-tight or too-loose fit, distortion, and other
circles. A t night and on dark days they are
damage. Oil the hinge sparingly if needed and wipe
replaceable by the illumination lamps.
off all excess oil. Inspect for a lost, cracked, or
4-27. Illumination Mirrors
broken mirror. Replace a defective illumination
mirror.
illumination mirrors.
b. Cleaning and Inspection. Clean the metal parts
t h e illumination mirrors.
with soap and water. Clean the mirror with a
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