Re: Haller / Cunningham "The Tesla High Frequency Coil" (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Wed, 04 Jul 2007 11:07:40 -0700
From: Barton B. Anderson <bartb@xxxxxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Haller / Cunningham "The Tesla High Frequency Coil" (fwd)

Hi Jeff,

I found the gap kind of cool also. Seems to me the friction electrode on 
the backside of the disc is not required. Just set the gap close but not 
touching on the back side and let the main gap adjustment on the front 
side handle the bulk of the gap spacing. That would at least prevent 
friction noise and wear.

I've built an "all metal" rsg disc a long time ago. The disc had 
cylinder electrodes attached about 1" length out from the disc. One 
common problem I found is that if the firing voltage is high enough, the 
gap would not quench as the arc actually creeped between electrodes 
along the disc. If only 4 or 5 kV, it's probably ok. I was running a 
pole pig at 14.4kV rms in my particular situation.

The wooden runners can be troubling (turn of the century look and feel 
however). I once had access to 100's of 1/2" diameter glass rods about 
30" length. They were used as corona wire support (erase rods) for those 
1/2 million dollar check printing systems and the rods were priced about 
$400 each. Very special glass composition with very tight tolerance (the 
diameter of the rod along it's length as this was key to ion deposition 
drum erasing. Unfortunately, I wasn't into coiling back then, so they 
were just garbage to me at the time.

Take care,
Bart

Tesla list wrote:

>---------- Forwarded message ----------
>Date: Wed, 4 Jul 2007 09:12:46 -0500
>From: David Thomson <dwt@xxxxxxxxxxxx>
>To: 'Tesla list' <tesla@xxxxxxxxxx>
>Subject: RE: Haller / Cunningham "The Tesla High Frequency Coil" (fwd)
>
>  
>
>>I'm recreating those projects in 3D CAD form, as the photos 
>>in the original book are a bit dark.  The CADs will allow 
>>me to make paper patterns for anyone with limited woodworking
>>tools that wants to try and build one.
>>    
>>
>
>  
>
>http://www.electrotherapymuseum.com/2007/HallerCunningham12in/index.ht
>m
>
>That is absolutely cool, Jeff.  This is one of the greatest services
>to Tesla coiling next to the math programs.  
>
>I never realized Tesla wound primaries extending the full length of
>the secondary. The RSG was very instructive, too.  Was that a variable
>speed DC motor?
>
>Dave
>
>David W. Thomson 
> 
>
>
>
>
>
>
>  
>