Original poster: robert & june heidlebaugh <rheidlebaugh-at-desertgate-dot-com>
I have used Beer Kegs in the past, Ther aluminum and stainless steel kegs
have rounded ends not sharp ends like an oil drum. I know that is not the
clasical toroid but they hold a charge to 2 mega volts.
Robert H
--
> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Mon, 15 Dec 2003 11:58:49 -0700
> To: tesla-at-pupman-dot-com
> Subject: Re: Alternate toroid shapes
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Mon, 15 Dec 2003 12:20:55 -0700
>
> Original poster: "Jim Lux" <jimlux-at-earthlink-dot-net>
>
> Oops.. hit the mousepad..
> The hemisphere on hemitoroid was advocated by Craggs and Meek as well (and
> probably Robert Van deGraaff as well), but probably not for any
> electrostatic field reason, but because it was easy/feasible to make. Some
> of the designs in Craggs and Meek have a somewhat flattened top (rather than
> a hemisphere), and you see, in the literature, references to "spherical
> electrode with re-entrant curvature where the belts go through"
>
> Some of the "big iron" vdg's (operating in pressure tanks) use a top
> electrode that is basically cylindrical, with a hemispherical top and the
> hemisphere with a hole with curved edges at the bottom, increasing the
> electrode capacitance (and, making more room for "stuff" inside the
> electrode, like ion guns, charging supplies, etc..
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, December 14, 2003 5:32 PM
> Subject: Re: Alternate toroid shapes
>
>
>> Original poster: Dave Leddon <dave-at-leddon-dot-com>
>>
>> Back in the sixties I purchased a three foot diameter spun aluminum oblate
>> from F. B. Lee (anybody remember his contributions to the Amateur
>> Scientist) who claimed that this shape, which resembles a hemisphere on
> top
>> of a toroid, was the best shape for a Van de Graff generator because it
>> would accumulate maximum charge while minimizing break down on the
>> supporting column. I often wondered if this shape would represent any
> sort
>> of improvement over the classical toroid.
>>
>> Dave
>>
>>
>> At 10:53 AM 12/14/03 -0700, you wrote:
>>> Original poster: Paul Nicholson <paul-at-abelian.demon.co.uk>
>>> John Richardson wrote:
>>>
>>>> Has anyone done any experimentation into toroid topload shapes
>>>> other than the typical round designs that all use?
>>>
>>> AFAIK little has been done.
>>>
>>> Toploads have two important parameters:
>>>
>>> a) the amount of charge they hold per unit volt, a.k.a the
>>> capacitance.
>>> b) the voltage at which they begin to issue streamers.
>>>
>>> Toroids tend to have a larger capacitance for a given breakout
>>> voltage, compared with sphere terminals. And they seem to be
>>> preferred for streamer formation, perhaps because of this.
>>>
>>> But who is to say there isn't a better shape? It could be
>>> that the best streamer formation comes from toploads with modest
>>> breakout threshold plus large charge storage.
>>>
>>> You could approximate your proposed tear drop cross section with
>>> a sphere or toroid with a disc shaped skirt, so that from a
>>> distance it looks a bit like Saturn. You would have to tell
>>> us whether it behaves any differently to a toroid plus breakout
>>> point.
>>>
>>> Plenty to do here for theorist and experimenter. See recent posts
>>> by Antonio for the relevant modelling programs.
>>> --
>>> Paul Nicholson,
>>> Manchester, UK
>>> --
>>
>>
>>
>
>