TM 5-6675-270-l5
Section VII. MAINTENANCE OF CANVAS FIELD PACK
d. Inspect the pack for ripped seams, and for
4-19. General
tears and cuts in the canvas and leather parts.
The field pack (fig. 2-5) is a canvass and leather
back pack. It permits easy and safe conveyance
e. Inspect the straps for cuts and breaks and
of the theodolite and accessories over all types
for damaged and missing buckles.
of terrain. The field pack must be properly main-
f. Inspect the thong drawstrings for weak spots
tained if it is to prevent loss of, or damage to,
and stiffness.
the surveying equipment in the field.
g. Inspect the shoulder strap for wear and
signs of weakness.
Replacement
h. Inspect the metal bow for breaks, bends, and
a. Brush all dirt from the outer side of the field
loose rivets.
pack with a stiff fiber brush. Invert the pack and
i. Restitch a ripped seam. Patch a small tear
clean out the inside with a soft cloth.
with canvas or similar material. Tighten a
b. Wash the canvas parts of the pack with mild
rivet. Replace a missing strap or buckle.
soap and water and dry thoroughly.
TM 10-269.
c. Wash the leather parts with saddle soap or
other leather cleaner.
j. Replace an unrepairable field pack.
MAINTENANCE OF COMPASS ASSEMBLY
Section Vlll.
4-22. Replacement
4-21. General
The compass enables the operator to orient the
compass from the theodolite.
target with magnetic north.
b. Replace a defective compass with a service-
able one.
compass.
Section IX.
MAINTENANCE
MICROSCOPE IEYEPIECES
4-23. General
Replacement
The eyepieces used on the theodolite consist of the
telescope and microscope eyepieces, the eyepiece
a. Telescope and Microscope Eyepieces.
prisms for both telescope and microscope, and
(1) Clean the eyepiece lenses with a lint-free
the telescope sunglass. The eyepiece prisms screw
cloth moistened with acetone or grain alcohol
directly into the telescope and microscope eye-
Dry and polish with lens tissue.
pieces, and the sunglass is a push-fit over the end
(2) Inspect the lenses for scratches, chips,
of both the telescope eyepiece and the telescope
cracks, and etching. Inspect all threaded surfaces
eyepiece prism. The eyepiece prisms permit sight-
for worn or damaged threads.
ing up to 65 from the horizontal.
(3) Replace a defective telescope or micro-
scope eyepiece.
4-24. Removal
b. Eyepiece Prisms and Sunglass.
a. Telescope and Microscope Eyepieces. Refer
(1) Clean the eyepiece prisms and sunglass
to figure 4-3 and remove the telescope and misco-
with a lint-free cloth moistened with acetone or
scope eyepieces.
grain alcohol. Dry and polish with lens tissue.
(2) Inspect the eyepiece prisms and sunglass
b. Eyepiece Prisms and Sunglass. Refer to
for chips, cracks, scratches, or etching. Inspect
the threads on the prisms for excessive wear or
and sunglass.
damage.
(3) Replace a defective eyepiece prism and
sunglass.
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