Rap 'n Tap
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From: KEN LADD
Date: 8/28/00
Time: 5:38:48 AM
Remote Name: 206.11.149.91
I have the article at home (very poor copy). I can find the reference and let you know but I'm sure it's Popular Science. It uses a series of small gage thermal junctions mounted in the metal base of an old light bulb.