Date: Tue Mar 17 10:01:49 2009 Back to Contents ------------------------------------------------------------------------

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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 Tue Mar 17 10:01:49 2009