Hi!

What about old railroad spikes?  Are they steel? If memory serves me right,
they're made of fairly high grade iron.  It shouldn't take too much to
machine them down into useable cores.

Mike
www.sciencearea.com


barry lotz wrote:

> Hi
>    Since it's been so quiet ....  It has been mentioned that iron makes
> a better material for sensor feedback coil transducers than steel. I
> have two questions which maybe someone can help. Do manufactured speaker
> coils have a better grade of material for use in feedback coils? I have
> looked around a little but can't seem to find a source of  iron plate or
> round stock. Any thoughts?
> Regards
> Barry
>
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