2-2.
Vertical
(upper)
and
horizontal
(lower)
circle
scales.
2 - 2 1 . Horizontal Circle Scale
quickly bring the theodolite to a preliminary leve
position.
The horizontal circle scale (fig. 2-2) appears in the
l o w e r part of the window as viewed through the
2-23. Plate Level
microscope eyepiece. This scale is graduated the
The plate level (6, fig. 2-3) is located at the bottom
s a m e as the vertical circle scale (para 2-20).
o f the opening between the alidade standards. The
2-22. Circular Level
plate level vial is graduated to aid the operator in
T h e circular level (8, fig. 1-1) is mounted on the
o b t a i n i n g precision leveling of the theodolite.
tribrach assembly (9, fig. 1-4). This level is used to
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