Show Summary Details

Quick Reference

An optical surveying instrument for measuring horizontal and vertical angles. It consists of a sighting telescope, with crosshairs in the eyepiece for focusing on the target, which can be rotated in both the horizontal and vertical planes. It is mounted on a tripod and a spirit level is used to indicate when the instrument is horizontal. The angles are read off graduated circles seen through a second eyepiece in the instrument.

Subjects: Physics.

Reference entries

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.