Date:

Author: George Herold

Subject: Re: Power Lines and compasses?

Post:

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Yup, a few to tens of milli-Gauss is a typical AC (60, 120 and 180 Hz.)
magnetic field strength in the lab enviornment. (At least that's the
level I see with our optical pumping apparatus.) I wouldn't be
surprised if the AC fields were much stronger under high voltage power
transmission lines, but I've never measured them.
=20
George Herold=20

________________________________

From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
Behalf Of Rick Tarara
Sent: Tuesday, March 17, 2009 12:03 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Power Lines and compasses?


http://www.energex.com.au/network/emf/community_emf_info.html
=20
seems to be a measurable effect--but at a very low level--20 milligauss.
=20
BTW: Driving through Colorado just in front of a very strong electrical
storm, I did notice that the cattle were congregating and orienting
themselves in a uniform direction. =20
=20
Rick
=20
***************************
Richard W. Tarara
Professor of Physics
Saint Mary's College
Notre Dame, IN
rtarara@saintmarys.edu
******************************
Free Physics Software
PC & Mac
www.saintmarys.edu/~rtarara/software.html
*******************************

----- Original Message -----=20
From: cbettis@unlserve.unl.edu=20
To: tap-l@lists.ncsu.edu=20
Sent: Tuesday, March 17, 2009 11:06 AM
Subject: Re: [tap-l] Power Lines and compasses?


Jim,
=09
Here is a link to the story:
=09
http://www.npr.org/templates/story/story.php?storyId=3D101945271
=09
=09
Cliff
=09
Quoting "Papp, James J " :
=09
> 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
>


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**
**Yup, a few to tens of milli-Gauss is a typical AC (60, 120 and = 180
Hz.)=20 magnetic field strength in the lab enviornment. (At least
that's = the level=20 I see with our optical pumping apparatus.) I
wouldn't be surprised = if the=20 AC fields were much stronger under
high voltage power transmission = lines, but=20 I've never measured them.**

** **

**George=20 Herold **
**

**
------------------------------------------------------------------------
***From:* tap-l-owner@lists.ncsu.edu=20
[mailto:tap-l-owner@lists.ncsu.edu] *On Behalf Of *Rick=20 Tarara
*Sent:* Tuesday, March 17, 2009 12:03 PM
*To:*=20 tap-l@lists.ncsu.edu
*Subject:* Re: [tap-l] Power Lines and=20 compasses?

**


**ht= tp://www.energex.com.au/network/emf/community_emf_info.html **
** **
**seems to be a measurable effect--but at = a very low=20 level--20
milligauss.**
** **
**BTW: Driving through Colorado = just in front=20 of a very strong
electrical storm, I did notice that the cattle were=20 congregating and
orienting themselves in a uniform direction. =20 **
** **
**Rick**
** **
*****************************
Richard = W.=20 Tarara
Professor of Physics
Saint Mary's College
Notre Dame, = IN
rtarara@saintmarys.edu
****= **************************
Free=20 Physics Software
PC & Mac
www.saintmarys.= edu/~rtarara/software.html
*******************************<= /DIV> **
**----- Original Message ----- **
** *From:*=20 cbettis@unlserve.unl.edu
<3D"mailto:cbettis@unlserve.unl.edu"> = **
** **
***To:* tap-l@lists.ncsu.edu <3D"mailto:tap-l@lists.ncsu.edu"> **
** **
***Sent:* Tuesday, March 17, 2009 = 11:06=20 AM**
** **
***Subject:* Re: [tap-l] Power = Lines and=20 compasses?**
** **
**
**
**
Jim,

Here is a link to the story:

http://www.npr.org/templates/story/story.php?storyId=3D10= 1945271


Cliff

Quoting=20 "Papp, James J " :
>=20 How do the cattle detect a magnetic field? How did the=20 researchers
> measure the cattle's alignment with the Earth's = magnetic=20 field?
Does the
> oscillating field of the lines register with = cattle at=20 all, as
opposed
> to a basically static field from the = earth? What=20 is the strength
of the
> power line field where the research = took=20 place? What is "near" to a
> power line, in meters? = How much=20 current did that line carry? Etc.
>
>=20 Jim
>------_=_NextPart_001_01C9A89D.974BECE0-- From
tap-l-owner@lists.ncsu.edu Thu Mar 19 10:46:47 2009 **

**

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