RE: [TCML] Tesla's topload

["Phil Tuck" <phil@xxxxxxxxxxx>]

Gents,
Taking the thread back a bit, I wonder how a true Tesla "bumped type" toroid
behaves with regard to streamer behaviour. I recently tried a single 'bump'
on my toroid in an effort to get a fixed point for a streamer to attach to,
but because of its lack of a sharp point, it was hopefully not going to
lower the toroid's hold-off voltage too much. This particular toroid's
'bump' can be seen here
http://www.extremeelectronics.co.uk/gaussfest2011/index.php on Derek's site
(about half way down titled "......which appeared to have caught something
nasty")

The results were disappointing though as while it provided a point for the
streamer to emit from without moving around, the discharge streamer seemed
to have less power to it with lengths down a bit as well.
When this was replaced with the conventional break-out point that I use, the
discharge was better (a  foot longer maybe, though not measured) despite
this replacement breakout being just an old screw with a point to it that
would definitely have lowered the top 'hold-off' voltage.
(The tuning was not affected to any degree as this was checked by a scope
and sig gen)

Regards
Phil Tuck
www.hvtesla.com


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: 06 April 2011 01:49
To: Tesla Coil Mailing List
Subject: Re: [TCML] Tesla's topload

I dunno, it would be interesting to model: say of sphere's with diameters
equal to a corresponding toroid minor diameter, but with the spheres spaced
apart so that 1/2 of the diameter of each sphere intersects the other
creating large bumps of sorts. Unfortunately not something Javatc can do as
the topload sphere's would have to be offset from center (not something it
can do now). Possibly Paul or Antonio's software could do a quick and dirty
comparison.

Take care,
Bart

On 4/5/2011 11:58 AM, Gary Lau wrote:
> I'm not sure that surface area correlates with effective capacitance.  
> If it did, then a corrugated aluminum duct topload would have 
> significantly higher capacitance than a smoothed-out one.
>
> Regards, Gary Lau
> MA, USA
>
> On Tue, Apr 5, 2011 at 2:21 PM, Weinhold Shannon L< 
> Shannon.L.Weinhold@xxxxxxxxxxxxxxx>  wrote:
>
>> Tesla's topload bumps were a novel way of increasing the surface area 
>> of an capacitive topload..allowing a smaller toroid to have the 
>> capacitance of a larger one.
>> Tesla indicated the need for one of the bumps on the top of the 
>> toroid to be slightly larger than the rest to allow the release of 
>> excessive energy in a harmless fashion, and therefore "avoid a 
>> disastrous blow to the framework supporting the electrode" (can't 
>> remember his exact words...but something quite dramatic that warned 
>> of the dangers of a random breakout of a streamer.)
>>
>>
>>
>>
>> Shannon Weinhold
>>
>> "Our virtues and our failings are inseparable, like force and matter.
>> When they separate, man is no more."
>> ~Nikola Tesla
>>
>>
>> -----Original Message-----
>> From: Tim [mailto:timothy.wenzel@xxxxxxxxxxx]
>> Sent: Friday, April 01, 2011 10:36 PM
>> To: tesla@xxxxxxxxxx
>> Subject: [TCML] Tesla's topload
>>
>> I have been wondering lately...why does Tesla's patent 1119732 and 
>> other designs show the topload with a surface covered in rounded 
>> bumps?  I assume that this prevented breakout to some extent as he 
>> was intending to create a corona effect according to the patents.  
>> His intent was wireless transmission of energy.  We design our coils for
a light show.
>>
>> Has anyone ever tried to re-create the surface indicated by his designs?
>> If so, what was the effect as compared to the smooth toroid with and 
>> without a single breakout point?
>>
>> T.J.Wenzel
>>
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