Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1980-12-22
1982-11-23
Martin, Jr., William D.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
33352, 33355R, G01C 1708
Patent
active
043598234
ABSTRACT:
A spherical compass having a gravity operated support for automatically positioning its double axis gimbal system into a horizontal plane for selective mounting of the compass with its outer athwartships gimbal system axis mounted horizontally and its fore and aft compass mounting plane oriented at any angle between the horizontal and vertical. The support comprises a gimbal support unit mounted within the pair of hemispherical compass bowls for limited vertical movement from a normal lowered position in frictional damping contact with the inner surface of the lower of the hemispherical bowls to a raised position of reduced frictional contact to permit gravity adjustment of the gimbal system fore and aft axis and the fore and aft lubber lines and compass card into a horizontal plane.
REFERENCES:
patent: 1294710 (1919-02-01), Roland
patent: 1376727 (1921-05-01), Pentz
patent: 2941307 (1960-06-01), Frisbie
patent: 3949483 (1976-04-01), White
patent: 3956831 (1976-05-01), Sibley
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