Re: Large Van De Graaf Sphere

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

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 



Tesla list wrote:
> 
> Original poster: "rheidlebaugh by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>
> 
> ED years ago I used a large Beer keg with rounded ends, not the small mini
> keg,  with satisfactory results. oil drums were to leaky and caused radio/tv
> interfearance problems. I can not get Sea buoy any more, but they were 5'
> dia 1/4 thick Nickel steel spheres that sold surplus for 100$. They were
> over 400 lbs to try to suport. Some old PROPANE tanks are spheres and less
> weight but they rust, and are dangerous to cut open with out soap, water,
> and  CO2
>    Robert  H
> > From: "Tesla list" <tesla-at-pupman-dot-com>
> > Date: Tue, 16 Apr 2002 17:38:03 -0600
> > To: tesla-at-pupman-dot-com
> > Subject: Re: Large Van De Graaf Sphere
> > Resent-From: tesla-at-pupman-dot-com
> > Resent-Date: Tue, 16 Apr 2002 17:48:11 -0600
> >
> > Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <evp-at-pacbell-dot-net>
> >
> > Tesla list wrote:
> >>
> >> Original poster: "Vivek Babtiwale by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <dr_vek-at-yahoo-dot-com>
> >>
> >> Have any of you had luck finding large Van De Graaf
> >> spheres for around $300? I wanted one that was 4 feet
> >> in Diameter.
> >
> > $300 doesn't sound like a bad price for a sphere that large.
> >
> >> Every place I leeked at says $600 for a
> >> sphere made of aluminum. I considered making one out
> >> of aluminum strips but am wondering if the junction
> >> edges will cause a leakage problem. Does anyone have a
> >> web site where they've see a home made one that works
> >> and didn't take more than two weeks to make?
> >
> > That's a mighty ambitious project to try to accomplish in 2 weeks!  I'd
> > be inclined to buy the one you mention.
> >
> > Ed
> >
> >
> >