telescope, and contains the vertical circle, micrometer
circle, collimation level, slow-motion screws, plate level,
It permits revolving and aiming the
telescope in any azimuthal or vertical direction.
126. U-Standard and Inner Vertical Axis
a. Removal and Disassembly.
disassemble the U-standard and inner
b. Cleaning, Inspection, and Repair.
(1) Clean all metal parts with an approved
(2) Remove the horizontal, vertical, and
cleaning solvent and dry thoroughly.
Clean the window and lens with lens
(3) Remove the horizontal circle housing
tissue or lens cloth.
(2) Inspect the U-standard for cracks,
damaged bearing surfaces, and worn or
Inspect the win
Figure 72. U-standard and inner vertical axis, removal, disassembly,
reassembly, and installation.