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If you can locate a good source of magnetite from beach sands, this  
might work.  This has been cleaned by the waves and should be dust free.


On Aug 1, 2007, at 6:26 PM, Max Scharfenberger wrote:

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> I am looking for a replacement material for iron filings.  We have  
> an exhibit in our Space Gallery that uses iron filings in a  
> circular drum which are distributed onto a couple of planets to  
> show where the magnetic poles are relative to axis of rotation.
>
> In order to deposit them on the tops of the planets, we have  
> rotating drum that picks up the filing and then drops them onto the  
> planets which have an electromagnet inside.  The problem that we  
> are running into is that the Plexiglas face plate only stays clean  
> for about 2 - 3 days and then starts to cloud over from the fine  
> iron dust that has been produced.
>
> If anyone has some suggestions I would really appreciate it.  If  
> you would like a picture of what I am talking about please e-mail  
> me off list.
>
> Thanks
>
> Max Scharfenberger
> VP Programs
> TELUS World of Science - Edmonton
> 11211 142 Street
> Edmonton, AB  T5M 4A1
> T (780) 452-9100
> F (780) 455-5882
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Kate Hintz
Collections Gallery Manager
Science Museum of Minnesota
651-221-4508


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