was wondering ...

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

Original poster: "Garry F. by way of Terry Fritz <twftesla-at-uswest-dot-net>" <garryfre-at-pacbell-dot-net>

Do those van de graaf generators from
<http://www.sciencefirst-dot-com>www.sciencefirst-dot-com operate as advertised?
 
They claim up to 4" sparks for the small one and 12" for the big one.
 
I calculated that at 25kv/inch the 200kv one should give up to 8" sparks and
the 400kv one up to 16" so maybe they are being conservative. 
 
Please reply off list if possible. No sense in cluttering up the list with
replys.