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

["Peter Terren" <pterren@xxxxxxxxxxxx>]

For high speed viewing of Tesla sparks I have used a rotating mirror forming 
a streak camera and have obtained 100ns per pixel vertically.  This means 
that a TC running at 100kHz will spark every half cycle and at 5us will be 
50 pixels apart on the camera. Terry Fritz also made up a unit with a better 
mirror but smaller camera. Here's mine with all home equipment.
http://tesladownunder.com/HVsparks.htm#High%20speed%20spark%20photography
Single events will need to be triggered with microsecond precision of a very 
small angle of the mirror but I haven't done that yet.
Peter

----- 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!)   ................................
Jeff
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