Magnetic compass

Details Magnetic compass Magnetic compass

1980-11-10

1982-11-09

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33349, 308 35, 308141, G01C 1706

Patent

active

043577563

ABSTRACT:
A magnetic compass comprises a case having a transparent cover and a magnetic compass card having a hub, which is rotatably supported on a central shaft projecting up from the base of the case by bearings comprising a thrust bearing between the hub and the upper end of the shaft and a radial bearing between the hub and a portion of the shaft spaced downwardly from the upper end. The radial bearing comprises a bearing ring set in a central recess in the hub and a full circle of small balls between the bearing ring and the shaft. In one embodiment there are two such radial bearings located one below the other. The bearings rotatably support the compass card on the shaft and retain it approximately perpendicular to the shaft even if the case is tilted.

REFERENCES:
patent: 1056544 (1913-03-01), Hoyt
patent: 2014024 (1935-09-01), Leatherman
patent: 2487044 (1949-11-01), Cude
patent: 2878578 (1959-03-01), Howard
patent: 3217420 (1965-11-01), Dinsmore
patent: 3588001 (1971-06-01), Mitchell
patent: 4260204 (1981-04-01), Hirt et al.

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