Power lines are mostly AC 50 or 60 Hz, are they not? Whereas the earths magnetic field is somewhat quasi-static?
- Bill Indecision may or may not be the problem. --- On Tue, 3/17/09, Luksich Mark-TXP763 <[email protected]> wrote: From: Luksich Mark-TXP763 <[email protected]> Subject: RE: Interesting Article To: [email protected] Date: Tuesday, March 17, 2009, 10:02 AM Having grown up in Indiana with lots of cows. The N/S and E/W orientation of cows has more to do with winds, sun, and the ambient temperature. perpendicular to the wind direction for cooling / perpendicular to the sun for heating........ Another case of taking one isolated fact and building a whole house of cards? Almost as good as the 10 year study on air pollution - people who live in areas with high air pollution have more respiratory problems. It took millions of $ and 10 years to figure that one out. Mark S. Luksich DMTS - Regulatory Engineering Office: 631-738-5134 Mobile: 631-827-9385 Fax: 631-738-3776 e-mail: [email protected] <http://us.mc01g.mail.yahoo.com/mc/[email protected]> ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of John Shinn Sent: Tuesday, March 17, 2009 2:12 AM To: [email protected] Subject: Interesting Article Interesting article on magnetic fields. Cattle respond to magnetic fields from power lines By RANDOLPH E. SCHMID, AP Science Writer Randolph E. Schmid , Ap Science Writer – Mon Mar 16, 5:21 pm ET WASHINGTON – High-voltage power lines mess with animal magnetism. Researchers, who reported last year that most cows and deer tend to orient themselves in a north-south alignment, have now found that power lines can disorient the animals. When the power lines run east-west, that's the way grazing cattle tend to line up, researchers led by Hynek Burda and Sabine Begall of the faculty of biology at the University of Duisburg-Essen in Germany report in Tuesday's edition of Proceedings of the National Academy of Sciences. They also found that cows and deer grazing under northeast-southwest or northwest-southeast power lines faced in random directions. The research team studied cows and deer using satellite and aerial images. In their report last August, Burda and colleagues suggested the north-south orientation was in response to the Earth's magnetic field. The new study adds weight to the animals responding to magnetic effects, since power lines also produce a magnetic field. And the effect was most noticeable close to the power lines, declining as the magnetic field of the electric lines was reduced by distance. Wind and weather can also affect which ways cows choose to face, but without such factors about two-thirds of them tended to align north-south when away from power lines. The Earth's magnetic field is thought to be a factor in how birds navigate, and other animals also are believed to respond to it. In addition to Burda and Begall, the research team included Julia Neef of the University of Duisburg-Essen , Jaroslav Cerveny of the Czech University of Life Sciences and Pavel Nemec of Charles University in Prague , Czech Republic . The research was supported by the Czech Science Foundation and the Ministry of Education, Youth and Sport of the Czech Republic. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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