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

A. on its outer spindle with a relative motion between the vernier and graduated scale of lower plate

B. on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate

C. on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate

D. on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate

✅ The correct answer is option C.

2586. If the lower clamp screw is tightened and upper clamp screw is loosened, the theodolite may be rotated____________?