Patent US3790882A successfully refreshed from Google Patents.
US3790882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dip magnet magnetometer having a damped pendulous support and temperature compensation
Assignee: CONIAGAS RESEARCH INC CA
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Filing: 1973-01-08
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Granted: 1974-02-05
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Expires: 1993-01-08
Abstract
Abstract This invention relates to a magnetometer having a dip magnet housing pivotally mounted on a damping base in a chamber filled with damping fluid. The damping base has an index means which has a zero reference line that overlies the locus of the end of a pointer carried by the dip magnet housing and the locus of the end of the pointer carried by the dip magnet housing has a direction that traverses the zero reference line. A viewing system overlies the index means and has a field of view that includes the zero reference line and the locus of the end of the pointer. A dip compensating magnet is adjusted as to position to rotate the dip magnet housing to align the pointer with zero reference line and the movement of the compensating magnet is an indication of the earth''s magnetic field.
Inventors
- 👤 E Sharpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:05
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/038
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
347 words
A magnetometer comprising a casing, a dip magnet assembly, said dip magnet assembly having a dip magnet housing and a damping base, said dip magnet housing having a dip magnet therein, said dip magnet housing of said dip magnet assembly being pivotally mounted on said damping base of said dip magnet assembly for dip movement of said magnet, said casing having a chamber for said magnet assembly, said chamber for said magnet assembly having a vertical pivot bearing for said damping base of said dip magnet assembly, said damping base having a bearing seat balanced on said vertical pivot bearing and free for rotation in azimuth, index means carried by said damping base and having a zero reference line inscribed thereon and being positioned to overhang the dip magnet housing, a pointer carried by said dip magnet housing of said dip magnet assembly having an end, the locus of the end of said pointer, as said dip magnet housing pivots on said damping base, being a locus line that underlies said zero reference line and that has a direction that traverses said zero reference line, a dip compensating magnet on said casing, means for adjusting the proximity of said dip compensating magnet with respect to said dip magnet to align the end of said pointer with respect to said zero reference line means for measuring the proximity of said dip compensating magnet to said dip magnet, a viewing lens system on the top of said casing overlying said zero reference line and the said locus line of the end of said pointer, said zero reference line and the locus of the free end of said pointer being in the field of view of said viewing leNs system, said chamber for said magnet assembly being filled with a damping fluid for said magnet assembly, said damping base having a damping annulus that extends outwardly of said bearing seat thereof to frictionally dampen pendulous oscillation of said magnet assembly about said pivot bearing, said dip magnet housing being of greater buoyancy in said damping fluid than said damping base.
Claim 2
Dependent Claim
347 words
A magnetometer comprising a casing, a dip magnet assembly, said dip magnet assembly having a dip magnet housing and a damping base, said dip magnet housing having a dip magnet therein, said dip magnet housing of said dip magnet assembly being pivotally mounted on said damping base of said dip magnet assembly for dip movement of said magnet, said casing having a chamber for said magnet assembly, said chamber for said magnet assembly having a vertical pivot bearing for said damping base of said dip magnet assembly, said damping base having a bearing seat balanced on said vertical pivot bearing and free for rotation in azimuth, index means carried by said damping base and having a zero reference line inscribed thereon and being positioned to overhang the dip magnet housing, a pointer carried by said dip magnet housing of said dip magnet assembly having an end, the locus of the end of said pointer, as said dip magnet housing pivots on said damping base, being a locus line that underlies said zero reference line and that has a direction that traverses said zero reference line, a dip compensating magnet on said casing, means for adjusting the proximity of said dip compensating magnet with respect to said dip magnet to align the end of said pointer with respect to said zero reference line means for measuring the proximity of said dip compensating magnet to said dip magnet, a viewing lens system on the top of said casing overlying said zero reference line and the said locus line of the end of said pointer, said zero reference line and the locus of the free end of said pointer being in the field of view of said viewing leNs system, said chamber for said magnet assembly being filled with a damping fluid for said magnet assembly, said damping base having a damping annulus that extends outwardly of said bearing seat thereof to frictionally dampen pendulous oscillation of said magnet assembly about said pivot bearing, said dip magnet housing being of greater buoyancy in said damping fluid than said damping base.
Claim 3
Dependent Claim
21 words
A magnetometer as claimed in claim 1 in which said dip magnet housing is substantially neutrally buoyant in said damping fluid.
Claim 4
Dependent Claim
23 words
A magnetometer as claimed in claim 1 in which the upper portions of said damping base are more buoyant than the lower portions.
Claim 5
Dependent Claim
50 words
A magnetometer as claimed in claim 1 in which said index means comprises a disc, having a circle inscribed thereon with the zero reference line being the diameter of the circle, said circle being slightly smaller in size than the viewing field of said means for viewing said index means.
Claim 6
Dependent Claim
23 words
A magnetometer as claimed in claim 2 in which the upper portions of said damping base are more buoyant than the lower portions.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |