Section VII. STAR PLATE
94. General
The star plate provides the means for quickly
attaching the theodolite to the tripod. It is equipped with
a spring plate which furnishes the proper tension on the
three leveling screws.
95. Star Plate
a. Removal. Refer to paragraph 54 and remove
the star plate.
b. Disassembly.
Refer to figure 40 and
disassemble the star plate.
c. Cleaning, Inspection, and Repair.
(1) Clean all metal parts with an approved
cleaning solvent and dry thoroughly.
(2) Inspect all threaded surfaces for worn or
damaged threads.
(3) Inspect the star plate nut, spring plate,
and star plate for bends, cracks, burs,
breaks, and worn or damaged bearing
surfaces.
(4) Straighten minor dents and remove burs.
Refinish and polish scratched or scored
bearing surfaces.
(5) Replace all defective parts that cannot be
repaired.
d. Reassembly. Refer to figure 40 and reassemble
the star plate.
e. Installation. Refer to paragraph 54 and install
the star plate.
Figure 40. Star plate, disassembly and reassembly.
Section VIII. PLATE LEVEL, VERTICAL CIRCLE ILLUMINATION PRISM,
MICROMETER CIRCLE ILLUMINATION PRISM, AND INVERTER PRISM
97. Plate Level
96. General
a. Removal. Refer to figure 41 and remove the
The plate level is used in conjunction with the
leveling screws for precision leveling of the instrument.
plate level.
The vertical circle illumination prism and micrometer
b. Disassembly.
Refer to figure 42 and
circle illumination prism direct the light to their
disassemble the plate level.
respective circles to permit their images to be viewed
c. Cleaning, Inspection, and Repair.
through the microscope eyepiece. The inverter prism is
(1) Clean all metal parts with an approved
used to project either the horizontal or vertical circle
cleaning solvent and dry thoroughly.
images or the microscope scale.
Wipe off the vial and vial cover with a soft
cloth moistened with
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AGO 5078A