RE: Parallel and Series LCR Circuit Qs

["Richard Barton" <richardbarton-at-caving5.freeserve.co.uk> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hi
	This forking pattern is common in nature, though the causes are
obviously different. The resultant pattern can be absolutely identical.
Something that comes to mind is the patterns in rocks of certain mineral
deposits (Dendritic ?). I have a sample of Pyrolucite, which is a lightning-
like growth on rock. It's like "Frozen lightning". If anyone wants to see
it,
Email me off-list and I'll try and scan it and send you a piccie.
						Richard Barton.


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, August 12, 2000 4:05 AM
To: tesla-at-pupman-dot-com
Subject: Re: Parallel and Series LCR Circuit Qs


Original poster: Terry Fritz <twftesla-at-uswest-dot-net>

Hi All,

One may be able to glean clues from brush discharges which really are just
forked streamers at high speed.  In my CW coil impedance experiment, I
thought that the streamers were just looking for uncharged space.  In other
words, the potential is trying to look for lower voltage regions and the
streamers just naturally fan out in different paths as the present one gets
charged.  Ideally, I think you would just get a even glow around the
terminal but the streamers tend to make hot channels in the form or arcs
much as natural rivers and streams do.  But the fanning effect is still
there.  I think if you trickle water down a sheet of glass or look at
streams on the sides of mountains, there is an analogy there...

Cheers,

	Terry


At 07:40 PM 8/11/00 -0700, you wrote:
>Even in a low pressure chamber (not really vacuum, but in the 1 torr area)
>you still get forked arcs. The chamber and stuff was cleaned quite
>thoroughly before pumping down, the chamber was evacuated fairly well, and
>then backfilled to the required pressure.  Dust would have a hard time
>remaining airborne without any air molecules to keep it up.
>
>It IS probably just some sort of random effect though.. The leader is
>developing, stops as charge accumulates within the leader.  Just then, a
>cosmic ray, or something, provides a localized area of lower dielectric
>strength, or enhanced field, which provides the direction to start off and
>it just keeps going.
>
>There is also a scale issue... the straight segments in lightning are
>fairly long (10's of meters)
>
>----------
>> From: Tesla list <tesla-at-pupman-dot-com>
>> To: tesla-at-pupman-dot-com
>> Subject: Re: Parallel and Series LCR Circuit Qs
>> Date: Friday, August 11, 2000 6:19 PM
>>
>> Original poster: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br>
>>
>> Tesla list wrote:
>> >
>> > Original poster: "Jim Lux" <jimlux-at-jpl.nasa.gov>
>>
>> > Interestingly, nobody is quite sure why long sparks, lightning, etc.
>form
>> > forked and erratic channels, unless it is just a random thing and one
>> > direction is as good as the other at each step in the leader formation.
> As
>> > you can imagine, making measurements about what is going on is, to say
>the
>> > least, challenging, at those speeds, esp if you don't want to perturb
>the
>> > fields or phenomena.
>>
>> I think that the erratic paths and forking may be caused by dust
>> particles in the air. The spark leaders would try to track along the
>> most conductive particles, and the spark would follow the same path.
>> It's actually possible see this happen if you try to produce sparks
>> between dusty electrodes. The sparks always hit the most proeminent
>> dust particles, and sometimes it's possible to see a spark tracking
>> over a long particle that was blown into the air.
>> I wonder what appearance sparks would have in very clean air.
>>
>> Antonio Carlos M. de Queiroz
>>
>>
>>
>>
>