Date: Thu Oct 9 13:05:31 2008

Author: Jerry DiMarco

Subject: Re: Another pacemaker question-ad lib

Post:

Reminds me of a story I heard while listening to a bluegrass show on
the college station. These oldtime musicians were talking about the early
days of bluegrass when they couldn't get any stations to play their
music. So they went down to Mexico where they had 100,000 watt stations
and convinced them to play their records, which could then be heard in
southern states. They remarked that the stations were so powerful you
could hear the music in the barbwire fences near the towers...

Jerry


At 10/7/2008 03:34 PM, you wrote:
>In the 1960's and 1970's we lived half a mile from WPGC in Morningside
>Maryland, and the station was picked up and made audible to us by our
>phonograph (while it was not playing a record). Bill
>
>-----Original Message-----
>From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On
>Behalf Of Paul Nord
>Sent: Tuesday, October 07, 2008 3:23 PM
>To: tap-l@lists.ncsu.edu
>Cc: Paul Nord
>Subject: Re: [tap-l] Another pacemaker question...
>
>BC,
>
>A little more doubting would be healthy for you.
>
>There's no clear evidence of dental radio reception. It's an urban
>legend.
>
>Paul
>
>
>On Oct 7, 2008, at 1:12 PM, Bernard Cleyet wrote:
>
> > But you never tested her, did you? Minimum single blind -- double
> > blind before I'd be convinced.
> >
> > bc still doubting.
> >
> > p.s. If "sensitive", numbers would be interesting. Note some people
> > receive radio stations from rectification in their metallic teeth
> > restorations. Conceivably? one could detect low freq. mag. fields
> > this way, and the reaction would be psychosomatic, i.e. detection
> > results in fear of pace maker disruption.
> >
> >
> >
> > On 2008, Oct 07, , at 08:24, Adam Beehler wrote:
> >
> >> Stan Dodds wrote:
> >>> ...The rest of the story may be true, but what she "feels" is more
> >>> likely caused by expectations rather than magnetic fields.
> >> Oh yes, I thought of that. So we checked. Let's just say that her
> >> doctor was convincing.
> >>
> >>> Refrigerator magnets are made from stripe-domain materials, like
> >>> lots of tiny horseshoe magnets, so the fields extend only a
> >>> millimeter or two beyond the magnet surface. Once stuck to a
> >>> ferromagnetic refrigerator casing, the field will be even more
> >>> effectively confined to the high-permeability material.
> >> Granted. This is one I did not check the effect of on her.
> >> However, a lot of refrigerators have more than just "refrigerator"
> >> magnets on them. Generally, those "refrigerator" magnets are lame
> >> at holding anything much onto the fridge, so stronger ones are used.
> >>
> >>> The magnetic fields produced by power supplies, presumably leakage
> >>> from the transformers, would also decrease rapidly with distance,
> >>> and would be at AC line frequency. If a few lab supplies really
> >>> had an effect, there would be essentially no place in a modern
> >>> building that the person could go that would not cause the same
> >>> feelings. It also seems unlikely that a company could sell a
> >>> device so vulnerable to the ordinary environment.
> >> All I know is that I could physically see a difference in her face
> >> when she walked out of the lab. She had to sit down to recoup.
> >> Granted, maybe she was psychosomatic, but I was certainly
> >> convinced. She was honestly not trying to just get out of physics
> >> either. Any labs she missed were made up in other ways. She was
> >> more than willing.
> >>
> >>> My best guess is that the student has been told, possibly
> >>> correctly, to avoid strong DC fields, and has generalized that
> >>> beyond its applicability. The advice from Medtronic, a major
> >>> manufacturer, seems fairly sensible:
>www.medtronic.com/wcm/groups/mdtcom_sg/@mdt/@crdm/documents/documents/electr
>omagnetic-compatibility.pdf
> >>> , and suggests that most activities are quite safe.
> >> I agree with you and this advice; however, I was just bringing up
> >> the point that each case is different and some people really do
> >> have to be that careful. She was great in that she was aware and
> >> took precaution. Maybe she took more precaution than was totally
> >> necessary, but wouldn't you in that situation?
> >>
> >> Adam Beehler
> >>
> >



Back