X-Message-Number: 20678
From: 
Date: Sat, 21 Dec 2002 16:31:59 EST
Subject: correction

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I misspoke myself a bit in an earlier posting today--not that it's important.

A thermopile is a stack of thermocouple-like devices in series, developing a 
potential difference or voltage when one side is warmer than the other. This 
depends on the Thomson effect, creation of an electric potential difference 
between two points in a conductor at different temperatures. The Peltier 
effect is the reverse; if a thermopile has the correct side inside a 
refrigerator and the other side outside, a current will cause the inside to 
become cooler. 

Robert Ettinger

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