Magnetic compass

Details Magnetic compass Magnetic compass

1982-05-17

1984-06-12

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33346, G01C 1708

Patent

active

044533179

ABSTRACT:
A magnetic compass including a flexible bowl having a rim with an annular inwardly facing groove. The inwardly facing groove is adapted to engage a flange of a transparent cover in a tight sealing relationship, the combined assembly enclosing a compass rose.

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patent: 3069783 (1962-12-01), Dinsmore
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patent: 3473234 (1969-10-01), Kjellstrom et al.
patent: 3502857 (1970-03-01), Cleveland
patent: 3628690 (1971-12-01), Sherman
patent: 3949483 (1976-04-01), White
patent: 4004348 (1977-01-01), Fowler et al.
patent: 4206845 (1980-06-01), Christian
patent: 4250627 (1981-02-01), Jarvenpaa et al.

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