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RE: oil dielectric

Original poster: "David Thomson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>

Hi Paul,

Tesla used iron cored secondaries, but I have not.  I don't know what the
effect would be by using stainless steel or any other type of material.


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, May 18, 2002 1:27 PM
To: tesla-at-pupman-dot-com
Subject: Re: oil dielectric

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"

In a message dated 05/15/2002 6:11:42 AM Pacific Daylight Time,
tesla-at-pupman-dot-com writes:

> >
> Hi Paul,
> I suspect you are correct. I have been meaning to ask,  what to construct
> the
> main support colum out of.
> I use the same PVC schedule 40 pipe I use to wind a regular coil.  When
> coil I make is finished, there is oil over the windings, but not in the
> center of the coil.  The center of the coil is air.  By putting one PVC
> inside of another I have made a jacket.  The outer pipe is held into place
> by schedule 40 end caps that have a hole in the center to slide over the
> inner pipe.  The joints and cracks are sealed with a good all purpose
> sealant.  Where possible, regular pipe cement is used.
> I've read that the best core for an air core coil is "air."  Tesla
> that a core of paraffin or oil had somewhat of less performance than an
> coil.
> >Finer wire to produce more turns?
> Finer wire so I can get more turns per inch.  Since the solenoid will be
> times the wire length of the flat spiral it will be more efficient if the
> length of the windings can be reduced.  I want to find the maximum voltage
> can get with this 250 watt power supply.
> Dave

Thanks for this information. I had not thought of concentric pvc pipes.
I have a type of ceramic caulk i can use, I think i could pour  between
the walls of the concentric pipes and then remove the outer pvc pipe.
This would give a ceramic surface to wind on. The maker of the ceramic
caulk recommends drying at high temperatures.
On a slightly different subject:
If the inside pipe
were stainless steel, covered with ceramic both inside and out,
do you think it would present a problem with the action of the coil?
(PS, non-magnetic stainless)