Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1985-09-10
1987-04-14
Little, Willis
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33356, G01C 1738
Patent
active
046567518
ABSTRACT:
A magnetic compass comprises: a gimbal mounted direct read card supported on a bearing in the equatorial plane of the compass in a compass bowl; and a housing having a base to which the compass bowl and corrector magnets are mounted; the corrector magnets being positioned above the base beside the bowl for access without moving the compass; means for supporting the corrector magnets located on three axes, one axis parallel to the lubber line and the equatorial plane of the compass in a horizontal orientation of the housing, a second normal to the lubber line and parallel to the equatorial plane and a third normal to the equatorial plane in a horizontal orientation of the housing and parallel to the lubber line and the equatorial plane in a vertical orientation of the housing; said corrector magnets mounted on two of said axes, said second axis and the one of said first and third axes parallel to said lubber line in the horizontal or vertical orientation selected for mounting said compass; the compass card assembly and the compass card extending below the equatorial plane at its periphery and having a mass therebelow at least as great as the mass above the plane and the housing positioned above the equatorial plane on one side below the equatorial plane on the other side for viewing the compass card at and below the equatorial plane; and light emitting diodes being provided within the housing on the one side for lighting the card and a non-magnetic battery power source being provided in the housing for powering the light emitting diodes.
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Anastos William N.
White W. Gordon
Little Willis
Rule Industries Inc.
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