Arrangement for compensating for magnetic declination in an opti

Details Arrangement for compensating for magnetic declination in an opti Arrangement for compensating for magnetic declination in an opti

1995-06-02

1996-10-01

Fulton, Christopher W.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33272, G01C 1702

Patent

active

055601146

ABSTRACT:
An arrangement for correcting declination in an optically readable bearing compass having a body enclosing a hermetically sealed capsule containing a compass card and a main reading line calibrated indicate bearing to the earth's magnetic pole without correction of declination. The compass body further includes an opening or passage having an optical system therein suited to facilitate taking the bearing indicated by the wind rose. The compass has a movable auxiliary reading line which is adjustable with respect to the compass body and the main reading line to both sides from its center position corresponding to the zero value of declination thus permitting the correction of bearing error caused by the geographic displacement between the true North Pole and the magnetic north pole.

REFERENCES:
patent: 2296285 (1942-09-01), Lear
patent: 3813792 (1974-06-01), Jarvenpaa
patent: 4531298 (1985-07-01), West, Jr.
patent: 4920656 (1990-05-01), Cross
patent: 5060390 (1991-10-01), Hill

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