Thread: Passive Human Detection System
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Old 02-18-2010, 22:42   #2
ElRog
Quiet Professional
 
Join Date: Jun 2005
Location: Fayetteville, NC
Posts: 24
Seeing the demonstration reminded me of water dowsing.

http://en.wikipedia.org/wiki/Dowsing

Operator uses the lifeguard in much the same fashion.
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