Re: Spark lenght.

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

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

The Handbook of Chemistry and Physics (some editions, anyway) has a needle
gap table*. The needles are #00 sewing needles, by the way. The needles need
to be sharp, and a fair ways (say 10 times the spacing) from any metal
object.
5kV    0.42 cm
10kV     0.85 cm
15kV    1.30 cm
20kV    1.75 cm
25 kV    2.20 cm
You'll note it's not linear, and giving the distances to two places is
somewhat spurious, because I'd be surprised if the accuracy of this is 10%.
Note, use the peak of the AC voltage! i.e. 11kV RMS = 1.414*11 or 15 kV
peak.

Small sphere are easy to come by... look for solid brass drawer pulls.
Perfect spheres aren't necessary, just get close.

*This table is at:
http://hot-streamer-dot-com/TeslaCoils/Misc/SGapVolt.jpg


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, November 12, 2001 5:43 PM
Subject: Spark lenght.


> Original poster: "Kamil Kompa by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<tcmail-at-poczta.fm>
>
> Hi!
>
> I have wound my own transformer(2000VA), and I think it is about 11kV.
> I have measured voltage on primary when secondary was connected to 230V,
> and it was 4.5V.
> I have also measured spark lenght between two nails and it was about
1,5cm.
> I have a table
> with spark lenght depanding on voltage, but only between spherical
> electrodes (i dont have smooth metal spheres).
> Can anyone using a 11kV transformer measure spark lenght between two wires
> (about 1mm diameter)?
> If it will be also about 1,5cm I will be sure that my transformer is
really
> 11kV.
> Thank You
>
> Kamil Kompa
>
>
> --------------R----E----K----L----A----M----A---------------
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