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>Max Scharfenberger, Wed, 1 Aug 2007, wrote
>I am looking for a replacement material for iron filings.

In a planetarium show we created about the Sun (Our Very Own Star; 
PASS volume 14; http://lhs.berkeley.edu/pass/), we used #4 lock 
washers in place of iron filings.   Worked great.  Much cleaner.

---Alan Gould 
Director, LHS Holt Planetarium
University of California
Lawrence Hall of Science #5200
Centennial Drive @ Grizzly Peak Blvd
Berkeley, CA  94720-5200
voice: 510-643-5082
e-mail: [log in to unmask]  
web: http://lhs.berkeley.edu/sii
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