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

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
Ans: c

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