When using a dumpy level or automatic level, the error due to instrument height changes or curvature and refraction over balanced distances can be eliminated or minimized by:

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Computer · Surveying & Levelling

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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using two backsights and two foresights and averaging

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Answer 1

using two backsights and two foresights and averaging

Answer 2

setting up exactly at the same height each time and recording the instrument height

Answer 3

always keeping instrument height equal on successive setups

Answer 4

subtracting the instrument height from staff reading always

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