Surveying
The difference between a level line and a horizontal line is that

level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
both are same
level line is a curved line while hori-zontal line is a straight line
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to eccentricity of verniers
error due to inaccurate graduation
error due to wrong adjustment of line of collimation and trunnion axis
error due to displacement of station signals

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