Re: Tesla Coil on TV Science Show.
Tesla List wrote:
> Original Poster: Esondrmn-at-aol-dot-com
> In a message dated 11/30/98 2:07:25 PM Pacific Standard Time,
> << >
> >Where does one get a copper sphere???
> try old toilets-- some have copper floats.
> Try stores like Home Depot, Eagle, etc. they have copper floats for water
> tanks that are seamless and have 1/4" treads into the bottom. Farm supply
> stores also have these for feed tank systems for animals.
> Ed Sonderman
As posted here recently, McMaster Carr sells various metallic spheres,
at rather ridiculous prices. One thing they sell at a more reasonable
price is polypropylene floats. An 8" diameter one is around $15.00.
That thing could be carefully wrapped with aluminum tape, carefully
burnished with a spoon, to make a pretty decent terminal. I intend to
try this for the next van de Graaf generator I build, and its should
work even better with a TC, which can tolerate more surface roughness.
Also, C&H Sales has an enormous stock of 12" globes (cheap world maps,
that is) for around $4.00 each. Only problem is the plastic is pretty
thick and they are quite heavy. Worth giving the same treatment.