Re: Measuring The Geomagnetic field

[William Beaty <billb@eskimo.com>]

On Tue, 7 Oct 1997, brian whatcott wrote:

> The bottle is arranged east-west.
> The water is 'polarized' with a DC current through the coil for a few
> seconds, then the coil is disconnected from the current source, and
> connected to the high-gain audio input.

The SciAm "Amateur Scientist" index site at www.thesphere.com/SAS will
tell you which issue this one was in.

I once saw a project article which mentioned that distilled water works
poorly because of the presence of dissolved oxygen, and is much improved
by boiling it in order to degas.


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