From: Rodney Davies[SMTP:rgd872-at-anu.edu.au]
Sent: Friday, August 01, 1997 7:48 PM
To: Tesla List
Subject: Re: Insulation
On Thu, 31 Jul 1997, Tesla List wrote:
> From: Richard Smit[SMTP:esmit-at-ilink.nis.za]
> Sent: Thursday, July 31, 1997 2:57 PM
> To: tesla-at-pupman-dot-com
> Subject: Insulation
> I want to know how a person can stop your secondary's coil last winding from
> discharging. I have a small 1 inch diameter iron ball on top as a discharge
> sphere. But at the last turn on my secondary there comes a 4 inch spark out
> and that energy is lost and aren't going to my small sphere.
> Anyone have Ideas on how to overcome this problem. I don't want to use a
> large torroid to make an shielding effect.
Question - what is the diameter of your secondary?
If it's greater than 1 inch, then you're going to have this effect,
however, you must at least 'trick' the coil into thinking there's a bigger
topload on it.
Ok, take a length of copper pipe and bend it into a perfect circle. (Best
to take it from the pre-coiled type copper you get from gas supplies or
Make this circle slightly larger than the diameter of your secondary, say
with 1/2" spacing between the loop and the outside of the secondary.
Next, Make a frame structure such that it will allow the circle of copper
to hang inline with the top turn of the secondary, aswell as connected
with the 1" ball...
Ok, perhaps a diagram can help... (I love ascii art! :-)
Top View -
/ /~|~\ \
|---( )---| <---- Copper pipe loop with a cross frame.
\ \_|_/ /
Side View - _
(_) <---- 1" ball
| ___|___ | <---- Cross frame support.
o=========o <---- Copper pipe loop inline with top
| | turn.
| | <---- Secondary Coil
This is basically increasing the effective diameter of your terminal
without actually building a toroid. I've seen this used on a coil once
before. Streamers were long and no arcing from the top turn occured.
Hope this helps...