The two-peg test for adjusting a dumpy level determines the:
Choose the correct answer
Height of the level above ground
Error in collimation (whether the line of sight is truly horizontal when the bubble is centred)
Distance measurement accuracy
Accuracy of the staff readings
Correct Answer
B. Error in collimation (whether the line of sight is truly horizontal when the bubble is centred)
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Two-peg test: set up level midway between two pegs A and B (50 m apart). Read staff at A and B (equal distances, collimation error cancels). Calculate true difference in elevation. Then move instrument near A, read A and B again. If difference differs from true difference, the line of sight is inclined (collimation error). Adjust using capstan screws.
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