Dipole for magnetic field compensation

摘要

A magnetic dipole of varying magnitude and orientation is disclosed wherein the dipole is comprised of an outer magnetic shell and an inner magnetic sphere which is rotatably mounted within the outer magnetic shell. Both the outer shell and the inner sphere are mode of magnetically rigid material and are each magnetized in a uniform direction parallel to a single longitudinal axis. The inner sphere is preferably rotated within the outer shell via a non-magnetic means such as a rod.