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Appendix B Glossary

003678_001

Hz0

ZA = Line of sight / collimation

axis

Telescope axis = line from the

cross hairs to the center of the

objective.

SA = Standing axis

Vertical rotation axis of the

telescope.

KA = Tilting axis

Horizontal rotation axis of the

telescope. Also known as the

Trunion axis.

V = Vertical angle / zenith

angle

VK = Vertical circle

With coded circular division for

reading the vertical angle.

Hz = Horizontal direction

HK = Horizontal circle

With coded circular division for

reading the horizontal angle.

Direction of gravity. The compensator defines the plumb

line within the instrument.

Angle between plumb line and standing axis.

Standing axis tilt is not an instrument error and is not

eliminated by measuring in both faces. Any possible

influence it may have on the horizontal direction or verti-

cal angle is eliminated by the dual axis compensator.

Instrument axis

Plumb line / compensator

Standing axis inclination

Glossary 103

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