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

on its inner spindle without a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle without a relative motion between the vernier and gra-duated scale of lower plate
on its inner spindle with a relative motion between the vernier and the graduated scale of lower plate
on its outer spindle with a relative motion between the vernier and graduated scale of lower plate

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Surveying
Pick up the correct statement for horizontal photographs.

The two sides of a road meet at the vanishing point
All listed here
The lines parallel to the negative plane are projected as parallel lines
Parallel lines do not appear parallel in central projection

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