Which of the following statements regarding the vertical circle of a theodolite is correct? 

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SSC JE Civil 06 Jun 2024 Shift 3 Official Paper - 1
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  1. Both the graduation circle and the Vernier scale move with the telescope. 
  2. The Vernier scale is fixed, but the graduation circle moves with the telescope. 
  3. The graduation circle is fixed, but the Vernier scale moves with the telescope. 
  4. Both the graduation circle and the Vernier scale are fixed, while the telescope moves.

Answer (Detailed Solution Below)

Option 2 : The Vernier scale is fixed, but the graduation circle moves with the telescope. 
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Detailed Solution

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Concept:

F1 Abhayraj Anil 10.03.21 D13

  • In a theodolite, the graduation circle (also known as the vertical circle) is attached to the telescope, so when the telescope moves (either up or down to measure vertical angles), the graduation circle moves with it.
  • This allows the angle of elevation or depression to be measured relative to the horizontal plane.
  • On the other hand, the Vernier scale is fixed in place, and its purpose is to allow for more precise readings of the graduation circle's movement.
  • As the telescope and the graduation circle move, the Vernier scale stays stationary, and the user reads the angular measurement from the point where the Vernier scale aligns with the graduation circle.
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