Compass

Details Compass Compass

1986-07-31

1987-10-20

Frankfort, Charles

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33345, G01C 1706

Patent

active

047004908

ABSTRACT:
A compass which is self-compensating for dip of its pointer arms irrespective of variances in the earth's magnetic forces at different geographical locations includes a magnet disposed beneath respective proximal portions of the pointer arms so that the pointer arms are parallel to the magnetic field of the magnet, with the magnet constructed to be counterbalancing with regard to the earth's magnetic fields. In a preferred embodiment, the magnet comprises a plastic disk with magnetic particles embedded therein, the disk having a chordal portion removed therefrom immediately beneath one pointer arm, and a damper pan assembly is controlled by a lift arm to selectively dampen the movement of the pointer arms.

REFERENCES:
patent: 2108263 (1938-02-01), L'Abee-Lund
patent: 2171755 (1939-09-01), Langsner
patent: 2294355 (1942-08-01), Hull
patent: 3191306 (1965-06-01), Kierans
patent: 3217420 (1965-11-01), Dinsmore
patent: 3502013 (1970-03-01), Shimoda
patent: 3585728 (1971-06-01), Ogg
patent: 3613251 (1971-10-01), Fitzpatrick et al.
patent: 4031348 (1977-06-01), Eberhardt
patent: 4055902 (1977-11-01), Jolley et al.
patent: 4088855 (1978-05-01), Emery
patent: 4175333 (1979-11-01), Kramer
patent: 4420665 (1983-12-01), Conrad

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