Don't know. I just watched her do it. The machine may have worked on the
rotor. Since it is iron it probably did... But there is no mechanical
connection between the rotor and the ally disc, so there must be some type of
field. She said the magnetic field was working on the disc. She said that
sometimes the residual magnetism is lost when the instrument case is opened. I
doubt that would affect an iron magnet. Maybe the disc has a magnetic
component in it's alloy or some other means of supporting a magnetic field.
It's all FM to me.
Bill Lawrence
> Date: Mon, 16 May 2011 18:35:03 -0400
> From: pennell@cox.net
> To: bspidell@comcast.net; healeys@autox.team.net
> Subject: Re: [Healeys] Speedometer gearing
>
> Bob, I agree. How do you gauss or degauss aluminium?
>
> Keith
>
> ---- Bob Spidell <bspidell@comcast.net> wrote:
> > but it's news to me that you can de/gauss
> > aluminum. Come to think of it, I don't believe Al is magnetic so I'm not
sure the drag cup is made of Al. Again, not
> > sure about this--anyone know?
> >
> > Bob
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