Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 5 (Q.No. 4)
Which one of the following statements is correct ?
when the axes of rotation of the graduated circle and the verniers are not coincident, the instrument possesses eccentricity
the mean of the readings of the two verniers gives correct reading free from the eccentricity
one vernier may be used if the readings of two verniers differ by a constant
all the above.
Answer: Option
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