Surveying
Which of the following errors can be eliminated by taking mean of bot face observations ?

error due to eccentricity of verniers
error due to line of collimation not being perpendicular to horizontal axis
error due to imperfect adjustment of plate levels
error due to imperfect graduations

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Surveying
The prismatic compass and surveyor’s compass

both give QB of a line and WCB of a line
both give WCB of a line
both give QB of a line
give whole circle bearing (WCB) of a line and quadrantal bearing (QB) of a line respectively

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