Topcon DS Series - 29. EXPLANATIONS; 29.1 High Accuracy with the 360° Prism

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29.EXPLANATIONS
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).
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.
29.1 High Accuracy with the 360° Prism
: Hexagonal points
: Prism sighting direction