TM 5-6675-307-14
point of solvent is 100 F. 138 F. (38
tool and accessory case to remove surface particles and
C.-59C.).
wiped gently with lens tissue. To remove stubborn
spots, use alcohol or acetone. As an alternative,
breathe on the lens and wipe with lens tissue. Use
2-14.
Operation in Salt Water Areas
extreme care to avoid scratching any of the optics
surfaces while cleaning. Protect the theodolite from
Salt is highly corrosive to metal. When using the
blowing dust and sand. Always place a protective cover
theodolite in salt water areas, wipe it frequently with the
over the instrument when it is not in use.
chamois. If salt water contacts the instrument, the
exterior non-optical parts should be thoroughly cleaned
2-13.
Operation Under Rainy or Humid Conditions
with cleaning solvent, Federal Specification P-D-680.
The exterior optical parts should be cleaned with alcohol
Inspite of its enclosed construction, the theodolite is not
or acetone.
water proof. In humid areas, a drop in temperature may
cause condensate to fog the lenses and prisms. Internal
2-15.
Operation in Snow
fogging can usually be removed by placing the
theodolite in a warm dry environment.
External
Visibility is sharply reduced while snow is falling. When
condensation may be removed using the chamois.
taking sightings after a snowfall, the use of suitable dark
During rainfall, protect the instrument with a surveyor's
glasses by the instrument man is recommended to
field umbrella; and between periods of use while it is set
reduce eyestrain and fatigue. If snow conditions are
up on the tripod, cover it with the waterproof hood. If
accompanied by extreme cold (below 0 F. (-18 C.),
the theodolite is wet, do not keep it in the carrying case
refer to paragraph 2-10.
any longer than necessary. As soon as possible,
remove the instrument and do not return it to the case
2-16.
Operation in Mud
until it is completely dry.
Mud is highly abrasive and if allowed to remain on
WARNING
threaded or sliding surfaces, moving parts of the
J Dry cleaning solvent, P-D-680, used
theodolite will soon bind and the instrument will become
to clean parts is potentially dangerous
inaccurate or inoperable. The theodolite should be
to personnel and property.
Avoid
carefully wiped clean. Be extremely careful not to
repeated and prolonged skin contact.
scratch lens or prism surfaces during cleaning
Do not use near open flame or
operations. Place a protective cover over the theodolite
excessive heat. Flash
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.
2-20
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