A theodolite is a precision surveying instrument used to measure horizontal and vertical angles. It is widely used in surveying, construction, engineering, mapping, and civil works for tasks such as setting out buildings, roads, bridges, and determining land boundaries.
MAIN PARTS
•Telescope – Used to sight the target.
•Horizontal circle – Measures horizontal angles.
•Vertical circle – Measures vertical angles.
•Leveling screws (foot screws) – Used to level the instrument.
•Plate level or electronic level – Ensures the instrument is perfectly horizontal.
Tripod – Supports the theodolite.
•Clamp and tangent screws – Lock and finely adjust the telescope's movement.
•Plumb bob or optical plummet – Centers the instrument over a survey point.