G - Physics – 01 – B
Patent
G - Physics
01
B
33/53
G01B 11/26 (2006.01)
Patent
CA 1079059
Abstract of the Disclosure. Methods and apparatus for vertical alignment of a borehole rig directly over a drilling site involve use of a signal generator placed in parallel orientation to the drilling mast or drill string and sighted in on the drill tar- get, then allowed to swing free to the true-plumb position, there- after bringing the mast back into parallel orientation with the now-plumb signal generator. 1a
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