If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated

- 1
  
  on it's outer spindle with a relative motion between the vernier and graduated scale of lower plate
- 2
  
  on it's outer spindle without a relative motion between the vernier and the graduated scale of lower plate
- 3
  
  on it's inner spindle with a relative motion between the vernier and the graduated scale of lower plate
- 4
  
  on it's spindle without a relative motion between the vernier and the graduated scale of lower plate

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