Section VIII. STAR PLATE
53. General
The star plate enables the operator to quickly and
accurately secure the theodolite to, and remove it from,
the tripod. This enables the operator to quickly move
the instrument from one station to another when closing
a traverse, or making measurements where speed and
extreme accuracy are required.
54. Star Plate
a. Removal. Refer to figure 32 and remove the
star plate.
b. Cleaning and Inspection.
(1) Clean all metal parts with an approved
cleaning solvent and dry thoroughly.
Clean the footscrews with a soft brush
dipped in an approved cleaning solvent.
(2) Inspect the star plate for burs, cracks,
breaks, or other defects.
(3) Correct all -deficiencies or report them to
field maintenance.
c. Installation. Refer to figure 32 and install the
star plate.
Figure 32. Star plate, removal and installation.
Section IX. ILLUMINATION MIRRORS
55. General
The horizontal circle illumination mirror and the
vertical circle illumination mirror are identical
assemblies used to reflect light inside the theodolite to
illuminate the vertical and horizontal circles.
56. Illumination Mirrors
a. Removal. Refer to figure 33 and remove the
illumination mirrors.
b. Cleaning and Inspection.
(1) Clean all metal parts with an
approved cleaning solvent and dry
thoroughly. Clean the mirror with a
camel's-hair brush, if dusty; clean
with a chamois, if foggy.
(2) Inspect the hinge action for stiff or
loose movement. Oil sparingly, if
necessary, and wipe off all excess
oil.
(3) Inspect for a cracked or broken
mirror. Inspect the metal mount for
bends, cracks, and breaks.
(4) Replace a damaged or defective
mirror assembly.
c. Installation. Refer to figure 33 and install the
illumination mirrors.
Figure 33. Illumination mirrors, removal and
installation.
AGO 5078A 43
