Theodolite

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Functional principle

A theodolite is used for measuring vertical and horizontal angels. The main parts are the horizontal and the vertical circles, which are scaled in gon. It is regularly placed on a tripod and features several spirit levels for adjusting the theodolite in the field.

Sketch of a theodolite with numbers indicating the functional parts. 1: Vertical circle. 2: Reading for vertical circle. 3: Spirit level axis. 4: Bulls eye spirit level. 5: Plumb-bob. 6: Fixation screw. 7: Tripod. 8: Clamps. 9: Horizontal circle. 10: Reading for horizontal circle. 11: Horizontal axis (tilt axis). 12: Clamp. 13: Telescope. 14: Vertical axis.