Zoom | 248Glossary
Crosshairs
Line-of-sight
error (horizontal
collimation)
Vertical index
error
Glass plate within the telescope with reticle.
The line-of-sight error (c) is the deviation from the perpen-
dicular 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).
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