2645Civil EngineeringMedium
Which of the following errors can be eliminated by taking mean of bot face observations?
Aerror due to imperfect adjustment of plate levels
Berror due to eccentricity of verniers
Cerror due to line of collimation not being perpendicular to horizontal axis
Derror due to imperfect graduations
Correct answer
C. error due to line of collimation not being perpendicular to horizontal axis
Explanation
The correct answer is error due to line of collimation not being perpendicular to horizontal axis.