Re: Glass/poly and more...
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Tuesday, September 16, 1997 9:27 PM
Subject: Re: Glass/poly and more...
> From: Daryl P. Dacko[SMTP:mycrump-at-cris-dot-com]
> Sent: Tuesday, September 16, 1997 6:35 AM
> To: Tesla List
> Subject: Re: Glass/poly and more...
> At 05:30 PM 9/15/97 -0500, you wrote:
> >A while back , perhaps 5 moths ago, I made a saline cap from
> >a very tall cylindrical wine bottle (Rene' Junot). The ouside was
> >wraped in aluminum foil, water sofner salt was poured in to the
> >shoulder level, then water water added to cover, motor oil filled
> >the remaining space as a sealant.
> >A small hole was drilled in the cork, and a #12 bare copper wire
> >was forced through it . The wire was then worked down the length
> >of the bottle as the electrode.
> >I then let it "settle" and it seemed that the air bubbled up into the oil
> >and out by itself! (cork was not fully installed).
> >Next step was AC seasoning with about 5KV for a few hours at a time.
> >Shortly after it's construction and preping, it measured 680 pf.
> >I must mention that was never used in TC service, but sat on the basement
> >floor for those 5 months. Now it reads 1200 pf.
> >Guess using a wine bottle makes it get better with age. (I'm joking)
> >Maybe the copper reacting with the salt is making copper cloride which
> >lowers the internal resistance and thus the impedance seen by the bridge?
> >I know you were looking for oil cap experiences, but I thought I'd throw
> >little experience in the ring anyway.
> >Jim M
> An interesting hypothsis follows:
> Glass will absorb water, forming a hydrated layer that increases with depth
> the longer it sits.
> Water has a very high (I'm on vacation and lost without my books) dieletric
> It would make sense to me that if glass sat in contact with water, it would
> make a better cap due to it's dieletric constant increase.
Unfortunately, water dissolves glass slowly which increases the ionic
content of the water and makes a less than suitable dielectric.