Geometrical instruments – Indicator of direction of force traversing natural media – Borehole direction or inclination
Patent
1980-09-22
1982-06-22
Corbin, David H.
Geometrical instruments
Indicator of direction of force traversing natural media
Borehole direction or inclination
33313, 405202, E21B 47022
Patent
active
043355200
ABSTRACT:
A stiff, straight spar is allowed to pivot about an anchor on the seafloor. he location of the bottom with respect to the top is then determined by measuring the tilt of the spar and computing the offset of the bottom relative to the top. The straight member uses its internal buoyancy to remain erect and stable while the weight of the anchor keeps it in place on the seafloor. The top of the spar is tracked by shore stations while the tilt and heading of the spar is monitored by an instrumentation system. Simultaneous readings of the shore instruments and the spar's tilt and heading indicators allow direct determination of the anchor location relative to the shore. An air ballast control enables the apparatus to be easily maneuvered on the ocean bottom by divers or on the surface and an internal plumb bob system allows calibration of the overall system.
REFERENCES:
patent: 3720066 (1973-03-01), Vilain
patent: 3862499 (1975-01-01), Isham et al.
patent: 3935642 (1976-02-01), Russel
patent: 4040189 (1977-08-01), LaCaste
patent: 4127991 (1978-12-01), Regan
Beers Robert F.
Corbin David H.
Daubenspeck Wm. C.
Pistel Nancy J.
St. Amand Joseph M.
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