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 graduated 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

Question

Quizplus · Accepted Answer

When the lower clamp screw is tightened and the upper clamp screw is loosened, the theodolite can rotate on its inner spindle. This allows for a relative motion between the vernier and the graduated scale of the lower plate, as the upper part of the instrument, including the vernier, can move independently of the lower, fixed part.

If the Lower Clamp Screw Is Tightened and Upper Clamp