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

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In shaft plumbing using the Weisbach triangle method, why is it critical that the instrument setup point forms an angle at the instrument (Weisbach angle) of less than 25 to 30 minutes of arc with the two plumb wires?

To minimize the propagation of distance measurement errors into the calculated bearing of the wire baseline To prevent optical parallax errors in the telescope reticle during short-range focusing To ensure that the plumb wires remain within the field of view without rotating the horizontal plate To eliminate the requirement for measuring the distance between the two plumb wires

Correct Answer:

To minimize the propagation of distance measurement errors into the calculated bearing of the wire baseline

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