On Sat, 28 Nov 2015 07:46:00 -0800 (PST), Christopher Tidy
wrote:

Are you sure? I'll bet the seal is against the metal motor shaft.
Plastic wears too quickly. Still, that would give you half an inch of
plastic to insulate _how_ many kV? Seems iffy at best.

There is no shaft seal. The motor is vertically mounted above the tank and a thick plastic shaft dips down into the liquid.

OK, if you say so, that's handled.

How you make a natural insulator (oil) into a carrier for electrons is
your next very interesting task. Let us know what you find. (Too bad
Mike's guy didn't pursue it.)

--
Courage and perseverance have a magical talisman, before
which difficulties disappear and obstacles vanish into air.
-- John Quincy Adams