listed in a above.
In addition, they enable the
b. Cleaning and Inspection.
instrumentman to take sightings and readings up to the
(1) Carefully clean the metal parts of the
zenith.
telescope and microscope eyepieces with
a clean, dry cloth.
c. Sunglasses. Two sunglasses are furnished with
(2) Remove dust or dirt from the lenses with
the theodolite. One is a triangular, three-color sunglass
a soft brush, lense tissue, or an approved
that may be installed over the telescope eyepiece prism.
cleaning solvent.
The other is a single-color sunglass that may be
(3) Inspect the eyepieces for worn or
installed over the telescope eyepiece. The function of
damaged threads, bent or broken metal
the sunglasses is to reduce glare when sightings or
parts, and chipped, cracked, or etched
observations are made against direct sunlight. When
lenses. Replace defective eyepieces.
not in use, the telescope eyepiece prism sunglass and
c. Installation. Refer to figure 31 and install the
the telescope eyepiece sunglass are stowed in the
telescope and microscope eyepieces.
accessory case.
51. Eyepiece Prisms
a. Removal. Refer to figure 17 and remove the
50. Telescope and Microscope Eyepieces
eyepiece prisms.
a. Removal. Refer to figure 31 and remove the
telescope and microscope eyepieces.
b. Cleaning and Inspection.
(1) Clean all parts except the lenses with a
cloth dampened with an approved
cleaning solvent.
(2) Clean the external part of the lenses with
a soft brush, lens tissue, or an approved
cleaning solvent.
(3) Inspect the lenses for chips, cracks, and
fungus etching. Inspect the metal parts
for bends, breaks, and worn or damaged
threads.
(4) Replace all defective parts.
c. Installation. Refer to figure 17 and install the
eyepiece prisms.
52. Sunglasses
a. General. The telescope eyepiece sunglass and
the telescope eyepiece sunglass (fig. 10) are push-fit on
the telescope. When not installed, they are stowed in
the accessory case.
b. Cleaning and Inspection.
(1) Clean the metal part of the sunglass with
a cloth moistened .with an approved
cleaning solvent.
Figure 31. Telescope and microscope eyepieces,
(2) Clean the external parts of the lens with a
removal and installation.
soft brush, lens tissue, or an approved
cleaning solvent.
(3) Inspect the eyepiece for bent or0 cracked
metal parts. Inspect the lens for chips,
cracks, and fungus etching.
(4) Replace a defective sunglass.
AGO 5078A 42
