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Re: Test Cap, dry/oil
From: Robert Davis[SMTP:RE.Davis-at-btinternet-dot-com]
Sent: Saturday, November 29, 1997 4:23 AM
To: 'tesla-at-pupman-dot-com'
Subject: RE: Test Cap, dry/oil
From: gweaver[SMTP:gweaver-at-earthlink-dot-net]
Sent: Thursday, November 27, 1997 10:16 PM
To: Tesla List
Subject: Test Cap, dry/oil
>I made a test capacitor. Metal plates are 5" x 12" aluminum foil. 6
layers
>of 6" x 13" poly .006 mil. I put a #24 copper wire on each metal plate
and
>rolled up the cap. Wrapped it with 2 turns of masking tape to hold it
together.
>The finished cap measures about 1.125" dia x 6" long. It measures .00129
>uf. on my meter.
Is this the dry capacitance?
>I connected the dry cap to a 6K 20 ma furnace ignition transformer and a
>tiny TC. The output sparks are 3" but not very hot. After 2 minutes of
run
>time the cap started getting warm. I placed the cap in a small container
>and poured oil over it. The TC sparks are still 3" long but the discharge
>sparks are now much hotter.
If its heating up its lossing energy, was there much in the way of corona
with the dry cap?
>I have been thinking about making a dry poly rolled cap for a small
portable
>desk top TC and did this test to see the results of a dry cap on the TC.
>The oil makes a big inprovement in the discharge sparks. The discharge
>sparks did not get any longer but the power output appears to be about
>double. Much thicker and hotter sparks.
Gary Weaver
Did you retune the coil after imersion of the cap?
I suspect that the addition of the oil may have increased the capacitance,
did you meter the cap after adding the oil (dielectric constant of the oil
is 2-3 times that of air)?
I think this is my first response to a post so, experienced members please
correct me if I am wrong.
Best wishes, Rob Davis (UK)