Accession Number : ADD009547

Title :   Compass Checker.

Descriptive Note : Patent,


Personal Author(s) : Cooke,Gordon R

Report Date : 20 Apr 1982

Pagination or Media Count : 7

Abstract : A device is disclosed for generating a rotatable magnetic field for calibrating 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 in 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 deg. The accuracy of the compass can thereby be tested. (Author)

Descriptors :   *Patents, *Compasses, *Calibration, *Sonar arrays, *Magnetic fields, Rotation, Geomagnetism, Instrument dials, Towed arrays, Performance(Engineering)

Subject Categories : Test Facilities, Equipment and Methods
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE