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RE: A photographic tutorial of Pancake Coil winding...with movies...(fwd)

---------- Forwarded message ----------
Date: Fri, 22 Jun 2007 21:03:00 +0000
From: Jeff Behary <jeff_behary@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: RE: A photographic tutorial of Pancake Coil winding...with
    movies...(fwd)

Hey Dave & Bart,

I saw your interesting Pancake Coil and Cylinder setup.
There was mention of strong shocks obtained even minutes after powering 
down.  I have noticed this with all of my Pancakes.  I think it has 
something to do with the wax and rosin mixtures used in the coils, making a 
type of Electrophorous.  (I'm sure you have seen those in the old Static 
Electric Books).  Since you use acrylic, maybe this also has a similar 
effect?  There is a considerable static charge buiilt up in these apparatus. 
  I have even placed a cardboard cylinder on top of the Pancake Coils and 
obtained sparks from the top with a metal electrode of a Wimshurst Machine!  
The sparks weren't huge, 1/2" or so, but still it was a lot of fun.

http://www.electrotherapymuseum.com/2007/CardboardStatic/StaticCardboard1.jpg

As for the cylinder acting like a coil, that's interesting.  I did remove 
the cylinder just now and took more operation photos and the coil worked 
better.  Perhaps it is just that your theory doesn't match the resonance of 
the coil according to the cap size I am using.  I wonder if replacing the 
tube back again and changing the capacitor value would make a marked 
difference in the discharge?  Any suggestions are more than welcome, in fact 
I can photograph the Pancake with all 128 combinations of the condenser if 
you guys want!  That would be fun.

http://www.electrotherapymuseum.com/2007/9inPancake/index.htm

Jeff Behary, c/o
The Turn Of The Century Electrotherapy Museum
http://www.electrotherapymuseum.com

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