RE: [TCML] Ultra-high speed movie of lightning arc channel formation

[jhowson4@xxxxxxxxxxx]

Those pictures are awsome.  how did you make them?  it looks to me that you took undeveloped photoppaper and shocked it. Where did you buy the stuff you needed?

jay

-------------- Original message -------------- 
From: Jeff Behary <electrotherapy@xxxxxxxxxxx> 

> 
> Bert, 
> 
> This is not so high-speed, but I did a few tests before as Lichtenberg Figures 
> directly on photographic film or paper. For the coils, I used small glass 
> fuses, the fastest-blowing at the smallest amperage I could find (at the local 
> hardware store). The concept was pretty simple, simply turn on the coil and the 
> fuse was instantly blown in a fraction of a second. (what fraction, 
> unfortunately, I don't know). What is interesting, is the amount of sparks 
> generated (and the branches, effluves, brush) in such a short amount of time. 
> Granted, a 1/100th or 1/20th of a second may be considered a long time for this 
> sort of exposure, compared to high speed cameras, but maybe not everything can 
> be captured quite as easy with a camera as by direct contact. If only there was 
> high-speed exposures possible directly on film. (Sounds like a new invention!) 
> 
> http://www.electrotherapymuseum.com/2005/2005-06-23/images/CencoDC0001ic.jpg 
> http://www.electrotherapymuseum.com/2006/KinDis1/images/ED0009a.jpg 
> http://www.electrotherapymuseum.com/2005/2005-06-23/images/CencoDC0000ic.jpg 
> http://www.electrotherapymuseum.com/2005/2005-06-23/images/CencoDC0002ic.jpg 
> http://www.electrotherapymuseum.com/2005/Film22May/images/FischerCenco0001.jpg 
> http://www.electrotherapymuseum.com/2005/Film22May/images/FischerCenco0008.jpg 
> http://www.electrotherapymuseum.com/2005/2005-06-14/images/Glossy20002i.jpg 
> http://www.electrotherapymuseum.com/2005/2005-06-14/images/Glossy20001i.jpg 
> http://www.electrotherapymuseum.com/2006/KinDis1/images/ED0005b.jpg 
> http://www.electrotherapymuseum.com/2006/KinDis1/images/ED0007a.jpg 
> 
> I can try to recreate some of these at a later date with a more precise way of 
> measuring time, maybe an X-Ray timer or something similar. I'm sure there is 
> something this half of the century that is more accurate than whats in my junk 
> pile. 
> 
> It would be interesting if a roll of photographic paper/film, large format, was 
> rapidly moving, like being transfered from a full roll to an empty roll spinning 
> in a lathe, with the coil discharging in one spot (say, centered on the roll's 
> width). If the mechanical constraints worked out so that the paper/film 
> travelled smoothly, even at high speed, it would be an interesting experiment to 
> see Lichtenberg figures at so many feet per second, how many, and how they 
> change. Damn hard to develop and fix such a long photo, but still, it would be 
> fun. 
> 
> I've seen the slow branching effect before with Tesla Coils. A coil that can 
> give a spark, say 3 - 4 foot long, operated at a fraction of the power normally 
> used (less than 100 watts, for example) with the spark gap open just enough for 
> it to fire once or twice a second (but not cease to fire). The sparks become 
> very branching, static-like, and strangely seem to low down just enough for you 
> to make out the invididual branches. Unfortunately you need your nose pretty 
> close to the sparks to really study this, and I've had a few too close for 
> comfort. Despite the low current, these sparks are beautiful but not very 
> friendly to get tangled with. 
> 
> Jeff 
> > Date: Sun, 10 Aug 2008 13:00:51 -0700> From: micro_wave@xxxxxxxxxxx> To: 
> tesla@xxxxxxxxxx> CC: > Subject: [TCML] Ultra-high speed movie of lightning arc 
> channel formation> > This is pretty amazing ultra-high speed video shot of some 
> lightning > strikes:> > 
> http://gizmodo.com/5034458/slow-motion-lightning-video-is-mindblowing-will-sell- 
> a-thousand-slo+mo-cameras> > I have to wonder if such a shot of a big Tesla coil 
> arc into free air > would exactly duplicate the arc channel formation, or how 
> might it differ?> > Does anyone on this list have "loan" access to one of these 
> type cameras?> > Bert Pool> > _______________________________________________> 
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