Re: [TCML] Lichtenberg on TV

[brianb@xxxxxxxxxx]

Bert/all, 

I saw Litchberg Figures when doing arcs to water while
creating the Plasma Ball display for the Swiss Science Museum
Technorama. If you download the "High Voltage Show" brochure from them
you can see one example. We also have some really spectacular extremely
slow-motion showing the branches actually forming.


http://www.technorama.ch/en/ [10]


http://www.technorama.ch/index.php?eID=tx_nawsecuredl&u=0&file=fileadmin/user_upload/ausstellung/vorfuehrungen/Hochspannung_Besuchertext_e.pdf&t=1326151904&hash=93e4eafdf3f00c81fd96edf02d71902b
[11] 

Regards,
Brian B. 

On 08.01.2012 14:56, Bert Hickman wrote: 

>
Good information, Carl. Lightning hitting a human is similar to 
>
lightning hitting a bag of salty water - fortunately most of the 
>
discharge current flashes over, instead of going through, the victim. If

> the victim is sweaty or rain-soaked, the surface flash can create a

> steam explosion that blows off the victim's clothing or shoes.
Because 
> of the higher peak current and persistent tail current (10's
or even 
> 100's of milliseconds), an unfortunate victim of a positive
lightning 
> strike usually doesn't survive.
> 
> A similar effect has
been observed by experimenters playing with HV 
> discharges to water
surfaces. As Carl's note suggested, the shape and 
> horizontal
excursion distance of the transient Lichtenberg figure can be 
>
controlled by adjusting the water's electrical conductivity. The purer

> the water, the longer the branches. Water with higher electrical 
>
conductivity develops shorter, brighter branches. Some examples of 
>
transient figures ("sliding sparks") on water:
> 
>
http://volcaniclightning.tripod.com/lichtenb.htm [5]
>
http://www.youtube.com/watch?v=8h0PEbqlYnc [6]
>
http://www.capturedlightning.com/frames/Z02A.jpg [7]And, in response to
Jim's question, a few years ago a rather well-known 
> HV experimenter
(who shall remain nameless) succeeded in creating a 
> small star-like
Lichtenberg figure on his hand by accidentally becoming 
> part of his
60 kV Marx generator's discharge circuit... :^)
> 
> Bert
> 
>>> On
1/7/12 4:08 PM, Bob Wroblewski wrote: 
>>> 
>>>> On the CBS network
television show A Gifted Man (Friday night 1/6/2012) the storyline
featured a young boy with a perforated eardrum. Upon removing his shirt
to check for other injuries there was a prominent Lichtenberg pattern on
his back. I immediately said to my wife he was hit by lightning. The
doctors on the show were puzzled and searched online to reach the same
conclusion soon after. My astonished wife said how did you know that
before the doctors? So I related a story of several Rochester Teslathons
where Bert Hickman made and sold Lichtenberg figures in various acrylic
forms and I have several on display in my office cubicle. They are also
viewable at his Teslamania.com website. Anyway the episode should be
available at the cable tv on-demand or network websites or hulu or
elsewhere on the interweb by now.
>>> I had a similar experience at a
family gathering where one of the guys was an ER physician, and he had
some journal with a "what causes this?" mystery puzzle in the back. It
was the photo of a man's back with a great Lichtenberg figure on it,
prompting speculations about some sort of weird dermatitis, or a surface
skin infection that had spread. I saw and instantly said, Lichtenberg
figure, he was hit by lightning. That's what it was, of course. Here's a
TC list question about which I've been wondering... Would such a figure
occur with an ordinary HV incident (e.g. contact with a power line). Or
would it have to be pulsed power with very high peak current/voltage?
Lichtenberg figures are similar to the dendritic treeing that occurs in
dielectric, but not from the same cause, as far as I know (and treeing
is a long duration aging kind of effect), although the fractal nature IS
similar (and for the same reason.. field distributions)
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