Date: Tue Mar 17 10:01:49 2009
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Author: email@example.com Received: from wm-imp-2.unl.edu (wm-imp-2.unl.edu [220.127.116.11]) by uni00ml.unity.ncsu.edu (8.13.7/8.13.8/N.20071210.01) with ESMTP id n2HDeIBG020118 for ; Tue, 17 Mar 2009 09:40:18 -0400 Received: from localhost (localhost [127.0.0.1]) by wm-imp-2.unl.edu (8.13.1/8.13.1) with ESMTP id n2HDgWZB013630 for ; Tue, 17 Mar 2009 08:42:32 -0500 Received: from lecturdemo.unl.edu (lecturdemo.unl.edu [18.104.22.168]) by wm-imp-2.unl.edu (Horde MIME library) with HTTP; Tue, 17 Mar 2009 08:42:32 -0500 Message-ID:
Subject: Power Lines and compasses?
I just read an article in the newspaper this morning claiming that
power lines affect cattle's sense of direction. The researchers say
that generally cattle tend to line themselves up with the earth's
magnetic field (which, along with our magnetic declination, may
explain cow dipping in our neck of the woods ;-) but if they are near
power lines they don't. My puzzlement is that the average magnetic
field from a power line ought to be zero since they transmit AC power
and they are strung in pairs. So I was wondering if any of you have
experience with using compasses around power lines (or around cattle
for that matter;).
From firstname.lastname@example.org Tue Mar 17 10:01:49 2009