TM 5-6675-312-14
returned to an instrument shop for overhauling as soon as possible. Cleaning intervals should be shorted considerably
for equipment subjected to salt air exposure. Salt is highly corrosive to metal.
f. Operation in Snow. Visibility is sharply reduced while snow is falling. When taking sightings after a snowfall, the
use of suitable dark glasses by the instrument man will reduce eyestrain and fatigue. If snow conditions are
accompanied by extreme cold (below 0 .) (-18 .), refer to paragraph 2-11a. Place dust/rain cover over theodolite
F
C
when it is not in use.
g. Operation in Mud. Mud is highly abrasive and if allowed to remain on threaded or sliding surfaces, moving parts
of the equipment will soon bind and the equipment will become inaccurate or inoperable. The equipment should be
carefully wiped clean with a soft, lint-free cloth. Be extremely careful not to scratch lens and prism surfaces during
cleaning operations. Place the dust/rain over the theodolite when not in use. When the tripod is set up on muddy
ground, leveling is extremely important and should be checked frequently. Anchor tripod legs firmly to avoid slippage
which will cause incorrect readings.
h. Operation at High Altitudes. No special procedures are required to operate the equipment at high altitudes.
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