Question
Download Solution PDFWhich of the following is not a fundamental line of theodolite ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
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.
Last updated on Mar 26, 2025
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