You earthquake enthusiasts will want to take a look at this seismograph
on ebay at
http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=333640427

The small bag contains sand which provides double duty as a damping
medium and recording medium.
-- 
Doug Crice			 http://www.georadar.com
19623 Via Escuela Drive		      phone 408-867-3792
Saratoga, California  95070  USA	fax 408-867-4900
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