In the process of levelling, a backsight is defined as:

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Computer · Levelling

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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The first staff reading taken after setting up the instrument

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Answer 1

Any staff reading taken on a point of unknown elevation

Answer 2

The last staff reading taken before shifting the instrument

Answer 3

The first staff reading taken after setting up the instrument

Answer 4

A fixed point of known elevation

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