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Question
Which one is not a fundamental axis of a theodolite?
A.
Line of sight
B.
Axis of altitude bubble
C.
Axis of plate level
D.
Horizontal axis
Answer ( Option B)

Axis of altitude bubble

Solution

There are five fundamental lines in a Theodolite:
1. Vertical axis (Azimuth axis): It is the axis about which the instrument rotates in the horizontal plane.
2. Horizontal Axis (Trunnion axis): It is the axis about which the instrument rotates in the vertical plane.
3. Line of Collimation (Line of Sight): It is the line that passes through the intersection of horizontal and vertical crosshairs and the optical center of the object glass.
4. Bubble Line (Level tube axis or Altitude level axis): It is a straight line tangential to the longitudinal curve of the level tube at its center. It is horizontal when the bubble is in the center.
5. Plate level axis: It is perpendicular to the vertical axis when the bubble is at the center.

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