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Re: skin effect
Original poster: "Jeremy Scott by way of Terry Fritz <teslalist-at-qwest-dot-net>" <supertux1-at-yahoo-dot-com>
Ryan,
At high frequencies, your nerves might not register
the sensation, but that doesn't mean everything is
okay. If you ever smell burning while doing this,
stop to check and see that it isn't your own skin
or muscle tissue.
Also, although the streamers may not hurt, I bet
contact with your primary tank circuit would. If ever
your streamers are long enough to touch you and the
tank circuit simultaneously, those arcs are conductive
paths between you and the tank. (You = Dead)
As for me, the only current I allow through my
body is via the usual organinc 9V battery tester.
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
>
> Hi Ryan,
>
> Skin depth is proportional to 1 / SQRT(F). So just
> a wild guess and if the
> skin depth of people is 1 meter at say 200kHz.
>
> d = SQRT( 200000 / 3300000 ) x 1 = 0.26 meters or
> about 10 inches.
>
> I have seen RF burns at 13.56 MHz and those burns go
> straight down into the
> body as do 350kHz burns.
>
> Although "skin depth" works well for metallic
> conductors, "I" personally
> think it has no meaning for a very high resistance
> materials like people
> are made from.
>
> Also note that microwave ovens (~2000MHz) cook large
> chunks of meat on the
> inside too... Water blocks microwaves some, but
> skin depth seems to have
> no meaning there.
>
> For all practical purposes, you can assume the RF
> currents go right deep
> inside you. The nerves simply don't react to it.
> People have reported
> nerve problems if they "overdo it". The RF currents
> do seem to favor
> flowing in the more conductive nerves and blood
> vessels concentrating any
> damage to those structures.
>
> Cheers,
>
> Terry
>
>
> At 12:27 AM 5/7/2003 -0600, you wrote:
> >My small coil actually resonates at around 3.3 MHz,
> does anyone know if this
> >would be a high enough frequency to cause the
> current to run completely over
> >the skin?
> >
> >I have taken the streamers from my coil directly to
> my hand (without much
> >shock sensation), and I have also done this with a
> coil operating at around
> >1.7 MHz, with more shock sensation. Does the amount
> of current in the
> >streamers depend directly on the turns ratio of the
> coil?
> >
> >Ryan
> >
> >
> >
> >-----Original Message-----
> >From: Tesla list [mailto:tesla-at-pupman-dot-com]
> >Sent: Tuesday, May 06, 2003 5:55 PM
> >To: tesla-at-pupman-dot-com
> >Subject: Re: Man inside sphere electrode (electrum)
> >
> >
> >Original poster: "Ben McMillen by way of Terry
> Fritz <teslalist-at-qwest-dot-net>"
> ><spoonman534-at-yahoo-dot-com>
> >
> >Hi all,
> > I've heard that they do the same thing with a
> figure 8
> >shaped coil and induce currents in the brain..
> supposedly
> >causing halucinations.. I have no idea what kind of
> >currents or energies are involved.. Some kid here
> at the
> >university wanted to try it with my 5400J can
> crusher.. I
> >told him he was crazy!
> >
> >Coiling In Pittsburgh
> >Ben McMillen
> >
> >--- Tesla list <tesla-at-pupman-dot-com> wrote:
> > > Original poster: "Finn Hammer by way of Terry
> Fritz
> > > <teslalist-at-qwest-dot-net>" <f-h-at-c.dk>
> > >
> > > guys!
> > >
> > > It is possible to induce electric current into
> the human
> > > body, it is
> > > done for therapeutic reasons, and the current
> induced
> > > appear to occeur
> > > in the nerves.
> > > http://www.magstim-dot-com
> > >
> > > I have seen one such machine at work, at the
> Electricity
> > > Museum, and a
> > > one turn coil in proximity of the 17 turns work
> coil
> > > revealed that the
> > > pulse length is 100µS, the current producing it
> is in the
> > > thousands of
> > > amperes, and the flux intensity is more than 2
> Tesla.
> > >
> > > Funny to work with: Place the coil where the
> halo of a
> > > saint would be,
> > > fire the coil, and you get funny looking,
> involuntary jaw
> > > movements. One
> > > of the office secretaries bit her tongue!. What
> a laugh
> > > :-).
> > >
> > > It is a disk launcher, really.
> > >
> > > Cheers, Finn Hammer
> > >
> > >
> > >
> > > Tesla list skriver:
> > > >
> > > > Original poster: "Terry Fritz"
> <teslalist-at-qwest-dot-net>
> > > >
> > > > Hi Rik,
> > > >
> > > > At 04:40 PM 5/5/2003 +0000, you wrote:
> > > >
> > > > >Hi all,
> > > > >web surfing i came across this
> > > > >http://www.lod-dot-org/teslacoils.html
> > > > >
> > > > >man sitting in a cage electrode on top of
> his large
> > > coil.
> > > > >He is safe from electric fields there (well
> known
> > > Faradey cage effect),but
> > > > >i was wondering what about magnetic
> fields.?
> > > > >I suspect part of magnetic field could
> enter hollow
> > > sphere and induce
> > > > >currents in man's body.
> > > > >How real is danger of that possibility?
> > > > >
> > > > >Rik
> > > >
> > > > The magnetic fields at the top of the coil
> are not
> > > that
> > > > extraordinary. Maybe 10's of amps. Greg
> had an
> > > electronic oscilloscope
> > > > with him that was not harmed. I would guess
> if people
> > > can stand the
> > > > magnetics of MRI machines, they can stand
> top of Tesla
> > > coils easily. The
> > > > currents in the coil could induce some
> voltage around
> > > one's body. But the
> > > > resistance of the body is so high the
> current would be
> > > nil.
> > > >
> > > > Cheers,
> > > >
> > > > Terry
> > >
> > >
>
>