sci.physics.electromag

On Apr 3, 9:25 pm, j...@specsol.spam.sux.com wrote:

> A non-magnetic cage around a compass will have no effect, conductivity
> isn't the issue for static magnetic fields.

What Jim means it a conductive enclosure (provided it isn't TOO
conductive) won't effect the static readings of the compass. (a
superconducting enclosure would block magnetic fields) On the other
hand the conductive enclosure could affect the speed of response of
the compass due to eddy current effects as the magnetic field is
changed or the device moved in that field. How much it affects the
the response depends on the details of the construction, of course.