Technical Terms And Abbreviations - Leica NA2 User Manual

Technical terms and abbreviations

Plumb line
By centring the circular level the
instrument is almost level.
A small instrument tilt remains
(the vertical axis tilt).
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Vertical
axis tilt
Plumb line
Compensator
The compensator in the
instrument is responsible for
compensating the vertical axis
tilt enabling an exactly horizontal
aiming.
The push button gives the
pendulum a slight tap to check the
functioning of the compensator.
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Line-of-sight
R
A
Plumb line
Backsight/Foresight/
Intermediate sight
For determining the height
difference (∆H) between the
ground points A and B the back
sight (R) is measured first
followed by the forward sight
(V). Additional points relating to
A are measured as intermediate
sight (S).
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V/S
B
(∆H)
Introduction
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