Compass checker

Details Compass checker Compass checker

1981-05-29

1982-04-20

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01C 2500

Patent

active

043252460

ABSTRACT:
A device is disclosed for generating a rotatable magnetic field for calibing a compass. The field generated overcomes the earth's magnetic field and any other nearby magnetic field. A U-shaped housing has a first calibrated dial on the top horizontal member and a dial on the bottom horizontal member. The dials are mechanically linked to rotate in unison. Each dial contains a pair of bar magnets. The compass to be tested is positioned within the interior of the U-shaped housing. An adjustment knob is provided for turning the top and bottom dials and thereby permitting orientation of the four magnets within a range of 360.degree.. The accuracy of the compass can thereby be tested.

REFERENCES:
patent: 517029 (1894-03-01), Clausen
patent: 2887873 (1959-05-01), Halpern et al.
patent: 3522723 (1970-08-01), Baker et al.

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