For orientation of a plane table with three points A, B and C, Bessel’s drill is

• 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
• 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
• 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
• 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.