Geometrical instruments – Indicator of direction of force traversing natural media – Magnetic field responsive
Patent
1976-02-06
1977-11-01
Aegerter, Richard E.
Geometrical instruments
Indicator of direction of force traversing natural media
Magnetic field responsive
G01C 1738
Patent
active
040559025
ABSTRACT:
A compass card has a depending hub supported on a pedestal by a needle bearing and the compass magnet is capable of rotatable adjustment on such hub and also vertically slidable for adjustment of the compass. The bottom of the hub has a flange of permeable material such as iron or steel, and clearance is provided for the vertical movement of the compass magnet on the hub in an arrangement such that the magnet is arranged to be pulled away from the flange and rotatably adjusted by an outside key magnet to compensate for the magnetic variation of the area in which the compass is to be used. A low friction washer is provided on the compass card above the hub to permit rotatable adjustment of the magnet thereagainst as the compass card is held frictionally against the compass housing by the influence of the exterior magnetic key member.
REFERENCES:
patent: 931359 (1909-08-01), Washburn
patent: 1639580 (1927-08-01), Thompson
patent: 2552332 (1951-05-01), Le Van
patent: 3177591 (1965-04-01), Jolley
Cranford William R.
Jolley William S.
Aegerter Richard E.
Eckelman Eugene M.
Shepperd John W.
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