Re: Displacement Current Revisited

To: tesla-at-pupman-dot-com
Subject: Re: Displacement Current Revisited
From: Bart Anderson <mopar-at-uswest-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
Date: Mon, 22 Mar 1999 11:51:01 -0700
Approved: twf-at-verinet-dot-com
John (All),

If Malcolm's LED's were possibly lit via far em fields and Reinhard's with
induction fields near the coil, I am curious how my lamp was lit? Again, I
connected one end only to RF ground and I was approximately 15 or 20 feet from
the coil. The lamp lit with "each" strike at the grounded end (no antenna and
reproducable - everyone should be able to do this).

The strike ring may be playing a part as it is being induced by the primary
just
as the secondary is. At the time of each induction (for lack of a better
thought), how does the secondary see ground? I guess I wonder if ground
potential is pulled up during induction phase of the primary when a strike ring
is used. Kind of makes one wonder what would happen with a flat spiral coil
below the primary as part of rf ground (just a spur of the moment thought).

Bart

Tesla List wrote:

> Original Poster: "John H. Couture" <COUTUREJH-at-worldnet.att-dot-net>
>
>   Malcolm -
>
>   I agree that the far field or electromagnetic field (Hertz) was what
> energized your LED's.
>
>   However, near the radio transmitter antenna there is also another field
> that Terman in his Radio Engineers' Handbook called the induction field
> (Faraday). This induction field reduces rapidly in strength with distance
> and is negligible a short distance from the antenna or Tesla coil unlike the
> EM field which reduces as the square of the distance.
>
>   Terman says that the induction field is stronger than the EM field near
> the antenna. I would expect that Reinhart's 25 watt lamp and wire antenna
> near the Tesla coil was energized by the induction field. However, Reinhart
> points out this was not a closed circuit, or was it? Note that the space
> shuttle tether system appears not to be a closed circuit but actually it is.
> Can you explain this circuit?
>
>   Coilers are apparently not familiar with the induction field around the
> Tesla coil. If I understand this field correctly a coiler should be able to
> detect the field with a compass placed near a TC while it is energized. The
> compass is not sensitive to the EM field but should deflect because of the
> magnetic effect of the induction field. The compass would have to be
> properly aligned and very close to the center of the secondary winding. Has
> anyone tried this test? Reinhart's lamp could be used but this is also
> sensitive to the EM field.
>
>   John Couture
>
> ><snip>
> >>   Is it correct that Malcolm's LED's were energized by the far fields and
> >> Bart's lamps were energized by the near fields. How can you prove this?