Nonmagnetic compass

Details Nonmagnetic compass Nonmagnetic compass

1979-10-30

1981-03-17

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33349, 33356, 33363R, 324247, G01C 1730

Patent

active

042558662

ABSTRACT:
A compass device for underwater use and having substantially no magnetic nature or influence utilizes three Hall effect generators in an array wherein two of the generators have their principal axes of magnetic response extending normal to one another and at 45.degree. to the axis of the third generator. The array is rotatable relative to a base carrying three lights and solid state analog logic circuitry for causing the lights to be variously lighted and extinguished to indicate a need to turn left, to turn right, or being on course.

REFERENCES:
patent: 3197880 (1965-08-01), Rice et al.
patent: 3237584 (1966-03-01), Keithley, Jr.
patent: 3280781 (1966-10-01), Koerner
patent: 3425648 (1969-02-01), Wipff et al.
patent: 3802088 (1974-04-01), Barrett et al.
patent: 3903610 (1975-09-01), Heaviside et al.
patent: 3905121 (1975-09-01), Takeda et al.
patent: 3939572 (1976-02-01), Erspamer
patent: 3952420 (1976-04-01), Benjamin et al.
patent: 4037328 (1977-07-01), Kuehn et al.

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