Question

'Transit the telescope' of a theodolite involves

• A. \( \text{Rotating the theodolite about its vertical axis} \)
• B. \( \text{Rotating the telescope about its trunnion axis} \)
• C. \( \text{Rotating the telescope about its line of collimation} \)
• D. \( \text{Rotating the theodolite by 90 degrees in horizontal plane} \)

Hint:

Think of transiting as flipping the telescope end-over-end in the vertical direction.

Answer 1

The Correct Option is B

'Transiting the telescope' of a theodolite refers to the operation of rotating the telescope about its horizontal axis, also known as the trunnion axis, through 180 degrees in the vertical plane. This allows for sighting in the reverse direction and is crucial for eliminating certain instrumental errors.