Explanations; High Accuracy With The 360° Prism - Topcon DS Series Instruction Manual

29.EXPLANATIONS

29.1 High Accuracy with the 360° Prism
Sighting can be more accurately performed by facing the 360° Prism toward the instrument. The 360°
Prism should be set up so that a pair of diametrically-opposed hexagonal points on its rubber flanges
are aligned with the sighting direction of the instrument (see the diagram below).
: Hexagonal points
When using the ATP1S, the 360° Prism should be set up so that a pair of diametrically-opposed marks
on top of the prism are aligned with the sighting direction of the instrument.
: Prism sighting direction
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