Surveying
The point on the photograph where bisector between the vertical line through optical centre of the camera lens and the plate perpendicular meets, is known as

Isocenter
Principal point
Plumb point
Perspective centre

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

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

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Surveying
A telescope is said to be inverted if its

vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is down

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