Point on the plumb line above the observer.
Glass plate within the telescope with reticle.
The line-of-sight error (c) is the deviation from the per-
pendicular between the tilting axis and line of sight. This
could be eliminated by measuring in both faces.
With a horizontal line of sight the vertical circle reading
should be exactly 90°(100 gon). The deviation from this
value is termed the Vertical index error (i).
sDIST
Indicated meteorological corrected slope distance
between instrument tilting axis and center of prism/
laser dot
hDIST
Indicated meteorological corrected horizontal distance
dHGT
Height difference between station and target point
Zenith
Crosshairs
Line-of-sight error (hori-
zontal collimation)
Vertical index error
Explanation of displayed
data
104 Glossary
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