Discussion :: Surveying
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For orientation of a plane table with three points A, B and C, Bessel's drill is
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A.
Align b through a and draw a ray towards c, align a through b and draw a ray towards c, finally align c through the point of intersection of the previously drawn rays |
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B.
Align c through a and draw a ray towards b, align a through c and draw a ray towards b, finally align b through the point of intersection of the previously drawn rays |
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C.
Align c through b and draw a ray towards a, align b through c and draw a ray towards a, finally align a, through the point of intersection of the previously, drawn rays |
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D.
In the first two steps any two of the points may be used and a ray drawn towards the third point, which is sighted through the point of intersection of previously drawn rays in the final step. |
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Answer : Option D
Explanation :
No answer description available for this question.
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