Figure 65. Horizontal circle, disassembly and reassembly.
(6) Straighten all dents and replace all
(3) Clean the horizontal circle with a lens
damaged parts that cannot be repaired.
cloth or lens tissue. Inspect the circle for
chips, cracks, or other damage. Inspect
the teeth of the circle mount for wear,
the horizontal circle.
burs, and damage.
(4) Inspect the clamp ring, contact ring, and
outer vertical axis for dents, cracks, and
vertical axis, contact ring, clamp ring, and
scratches, rust, and other defects.
It also supports the U-standard and contains the
horizontal circle and vertical axis.
The leveling screws are the means by which the
117. Leveling Screws
theodolite is precisely leveled as indicated by the plate
a. Removal and Disassembly.
level. The horizontal circle drive is used to rotate the
horizontal circle to any desired position without rotating
the U-standard. The illumination socket, located on the
circle housing, provides a mount for the horizontal circle
disassemble the leveling screws.
b. Cleaning, Inspection, and Repair.
(1) Clean all parts with an approved cleaning
circle housing comprises the lower part of the theodolite
solvent and dry thoroughly.
to which the leveling screws and star plate are mounted.
(2) Inspect the threaded surfaces on the point
screw, knob, and nut for wear