Title: Boring rig alignment apparatus and method

Abstract: Methods and apparatus for vertical alignment of a borehole rig directly over a drilling site involve use of a camera placed in parallel orientation to the drilling mast or drill string and sighted in on the drill target, then allowed to swing free to the true-plumb position, thereafter bringing the mast back into parallel orientation with the now-plumb camera.

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Inventors: Crow, Morgan LeVon (Dallas, TX, US)

Application Number: 600324
Filing Date: 1975-07-30
Publication_date: 1977-04-12
Assignee: Dresser Industries, Inc. (Dallas, TX)
Primary Class(es): 33/286 33/1H, 33/228, 33/309, 356/149
Other Classes:
US Patent Ref:

2517295	Aug, 1950	Esher	33/275.
3426146	Feb, 1969	Seaman	178/DIG.
3635565	Jan, 1972	Colson	33/228.

Other Refs:
Primary Examiner: Martin, Jr., William D.
Assistant Examiner:
Attorney: Caddell; Michael J.