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<p>[QUOTE=&quot;kanga, post: 570636, member: 9270&quot;]We used to use thermocouples when I was a weatherman.</p><p>A loop of two wires of different conductivity joined end to end was made.</p><p>One end where the wires joined was kept at a constant and known temperature.</p><p>The other was placed in a location whose temp you wanted to know, in our case outside in a weather shelter.</p><p>A small but measureable electric current was created when the temps at the two ends were different.</p><p>Calibrated correctly, it produced a more accurate reading than a mercury thermometer.</p><p>And recording thermographs were only used when you needed an approximate temp.</p><p>&nbsp;</p><p>We used thermocouples in Yuma, AZ, where the temps on the ends were <u>considerably</u> different, particularly in the summer.[/QUOTE]</p><p><br /></p>

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