Re: Recent power arc experiments

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

NaCl is also much more corrosive, in my experience... Copper Sulfate (or
Sulphate, if you prefer) is readily available at a variety of places.
Drugstores, big garden shops (they use it to kill trees), etc.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, February 24, 2001 11:46 AM
Subject: Re: Recent power arc experiments


> Original poster: "Bert Hickman by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>
>
> Boris,
>
> The only potential problem with the NaCl solution is that electrolysis
> may liberate gases which could then build up excessive pressure inside
> the tube. If you can get some inexpensive CuS04 and seal the ends of the
> tube with copper electrodes, it should work. If you kept the tube
> vertical, it may even be possible to use a small hole on the top
> electrode to allow gases to vent, in which case a dilute solution of
> NaCl would probably work fine.
>
> -- Bert --
> --
> Bert Hickman
> Stoneridge Engineering
> Email:    bert.hickman-at-aquila-dot-net
> Web Site: http://www.teslamania-dot-com
>
> Tesla list wrote:
> >
> > Original poster: "boris petkovic by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <petkovic7-at-yahoo-dot-com>
> >
> > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > > Original poster: "Bert Hickman by way of Terry Fritz
> > > <twftesla-at-uswest-dot-net>" <bert.hickman-at-aquila-dot-net>
> > >
> > > Hi Boris,
> > >
> > > Water resistors are made not bought... :^)
> > > A water resistor is simply an insulated tube
> > > containing an ionic
> > > solution of water and a metal salt (usually copper
> > > sulfate) capped with
> > > electrodes on each end. It's sometimes called an
> > > electrolytic or copper
> > > sulfate resistor. These are often used in high
> > > voltage and pulsed power
> > > work because of their capability to absorb
> > > considerable power at high
> > > voltages without breakdown. It can be fabricated
> > > using clear flexible
> > > vinyl tubing with properly sized copper electrodes
> > > sealing each end. The
> > > electrolyte is simply distilled water and copper
> > > sulfate - the more
> > > dissolved CuSO4 or the larger the internal diameter
> > > of the tubing, the
> > > lower the resistance, and total resistance simply
> > > scales linearly with
> > > length.
> > >
> > > When current flows through the resistor, copper is
> > > simply electroplated
> > > from the anode to the cathode with little, if any,
> > > evolution of gas at
> > > the electrodes. Because of the excellent thermal
> > > capacity of water, it
> > > can absorb huge amounts of pulsed power safely and
> > > predictably. I was
> > > originally going to water resistors as charging and
> > > bleeder resistors on
> > > the Quarter Shrinker before I found a batch of 20k
> > > 225 watt power
> > > resistors at the local recycling center (dump!).
> > > Some difficulties with
> > > using these: the resistance will slowly change over
> > > time as ions leach
> > > from the electrodes, and (in unheated labs) they may
> > > tend to freeze
> > > during the winter in northern climates.
> > >
> > > Jim Lux has an excellent article proving specific
> > > design information for
> > > these at his site:
> > >   http://home.earthlink-dot-net/~jimlux/hv/rwater.htm
> > >
> > > -- Bert --
> > > --
> > ---
> >
> > Personally,I have small diameter-d=5mm ,but long glass
> > tube(dating since my early scientific  and boy's
> > chemicist days).
> > Could this be good in combination with destilated
> > watter and small amounts of NaCl powder?
> >
> > Thanks,for the link.I'll take a look at it.
> >
> > Regards,
> > Boris
> >
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