Date: Tue Mar 17 10:24:49 2009 Back to Contents ------------------------------------------------------------------------

Author: Papp, James J

Subject: Re: Power Lines and compasses?

Post:

How do the cattle detect a magnetic field? How did the researchers
measure the cattle's alignment with the Earth's magnetic field? Does the
oscillating field of the lines register with cattle at all, as opposed
to a basically static field from the earth? What is the strength of the
power line field where the research took place? What is "near" to a
power line, in meters? How much current did that line carry? Etc.

Jim

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Papp, James J
Sent: Tuesday, March 17, 2009 9:04 AM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Power Lines and compasses?

Does the line signal perhaps drown out the earth's field?

Jim

-----Original Message-----
From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of cbettis@unlserve.unl.edu
Sent: Tuesday, March 17, 2009 8:43 AM
To: tap-l
Subject: [tap-l] 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;).

Cliff




From tap-l-owner@lists.ncsu.edu Tue Mar 17 10:24:49 2009

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