Elementary Mine Survey Certificate Exam Practice Questions - Elementary Certificate In Mine Survey (South Africa) Exam

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When observing with a theodolite, what is the principal reason for taking both Face Left (FL) and Face Right (FR) readings to a target?

To double the magnification of the telescope for distant targets. To eliminate index error of the vertical circle and horizontal collimation error. To calculate the curvature of the Earth over long underground sights. To automatically compensate for tension variations in the measuring tape.

Correct Answer:

To eliminate index error of the vertical circle and horizontal collimation error.

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