telescope, and contains the vertical circle, micrometer
(5) Remove
the
circle
circle, collimation level, slow-motion screws, plate level,
illumination prism (par. 99).
and prism.
It permits revolving and aiming the
(6) Remove the vertical circle illumination
telescope in any azimuthal or vertical direction.
prism (par. 98).
126. U-Standard and Inner Vertical Axis
(7) Refer to figure 72 and remove and
a. Removal and Disassembly.
disassemble the U-standard and inner
vertical axis.
b. Cleaning, Inspection, and Repair.
(1) Remove the telescope axis bearings
(pars. 122 and 124).
(1) Clean all metal parts with an approved
(2) Remove the horizontal, vertical, and
cleaning solvent and dry thoroughly.
collimation slow-motion screws (par. 108).
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
(4) Remove the plate level (par. 97).
damaged threads.
Inspect the win
Figure 72. U-standard and inner vertical axis, removal, disassembly,
reassembly, and installation.
AGO 5078A
87
