sci.physics.electromag

On Apr 3, 8:44=A0pm, Paul wrote:
> From what i've read, it sounds like the permeability
> of a conductive enclosure will increase the density
> of the lines of magnetic flux within the conductor,
> so that the magnetic field within the enclosure
> will be less intense, which in effect can make
> the compass less accurate (or slower to respond).
>
> I'll be using a Honeywell digital compass, and
> I need to know if the metal chassis will need
> to have openings around the compass or not.
>
> Or, i may need to use a plastic enclosure instead.
>
> Both purely mathematical/theoretical and real-world
> answers welcome.

but a cage of magnetic material will shield the compass. just pointing
that out.