Leica Builder Series User Manual page 15

Builder, Technical Terms and Abbreviations
Term
a) Line of sight / collimation axis
b) Standing axis
c) Tilting axis
d) Vertical angle / zenith angle
e) Vertical circle
f) Horizontal angle
g) Horizontal circle
Description
Telescope axis = line from the reticle to the
centre of the objective.
Vertical rotation axis of the instrument.
Horizontal rotation axis of the telescope.
With coded circular division for reading the
vertical angle.
With coded circular division for reading the
horizontal angle.
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