TM 5-6675-307-14
Figure 2-13. Circle and microscope scales.
Table 2-1 Controls and Indicators
Name
Description
Purpose
Compass focusing knob
Knurled ring
Focus on compass graduations
Telescope (coincidence) level
Bubble vial
Establishes horizon line of sight
Telescope objective focusing knob
Knurled cylinder
Focus on sighted object
Microscope focusing knob
Knurled ring
Focus on circle images
Telescope eyepiece knob
Knurled ring
locus on reticle lines
level tangent screw
Hex shaped knob
Center level bubble
Plate level
Bubble vial
Level theodolite
Horizontal motion clamp
Knurled knob
Lock horizontal tangent screw to leveling
head
Horizontal tangent screw
Knurled knob
Precise horizontal positioning of
telescope
Clamp screw
Knurled knob
Lock theodolite with tribrach
Vertical tangent screw
Knurled knob
Precise vertical positioning of theodolite
Circle illumination mirror
Hinged glass mirror
Reflect light on circle images during
daytime operation
Telescope reticle illumination knob
Knurled knob
Project desired amount of light
Altitude bubble illumination mirror
Hinged glass mirror
Reflect light on bubble during daytime
operation
Optical plummet eyepiece
Knurled ring
Focus on plummet reticle
Leveling screws
Knurled knobs
Leveling theodolite
Circular level
Bubble vial
Leveling theodolite
2-13
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