Re: Large Van De Graaf Sphere

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Finn Hammer by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<f-h-at-c.dk>
> 
> All
> 
> I discussed this subject with my metal spinner, last time I saw him, to
> pick up the shells for the _copper_ toroid that is going to grace the
> final version of the Museum Coil.
> 
> The idea was to use a half toroid as the bottom part, and a slightly
> squashed halfsphere as the top part. I`m not shure it would be optimal,
> but my theory is, that the toroid bottom would give very low leakage
> corona, as compared to a spherical shell with unshielded cutouts for the
> belt.
> In this case the belt could enter the inside of the topload trough the
> flat plate that constitutes the center disk of the toroid.
> 
> I thought it might be an idea to fabricate a small batch to tesla coil
> builders who got slightly bored with having relatively low voltages to
> play with, and wanted to upgrade their experience with a kick a** Van
> der Graaf MV+ generator.
> 
> I`m not disrespecting the tesla coil here, just pointing out that the
> idea of having a slumbering MV+ at your disposal, right off a top
> terminal, for attraction or repulsion, or plain one shot fun, might
> appeal to some select few..... :o)
> 
> Since I have rediscovered that copper is so much easier to join and
> finish, as compared to alluminium, this metal would be the choise, and a
> price of around 600 USD would have to change hands to get it.
> 
> Diametre would be 600 mm or ~24"
> 
> Cheers, Finn Hammer

	That proposed shape is ideal; there's no need for an indent in the
top.  The price may be reasonable from the standpoint of the spinner,
but more than I would pay.  If you should have something spun, be sure
to ask for the thinnest metal possible, to keep the weight down.

Ed