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Re: Strange shock (fwd)
Hi All,
Just to add to David's observation, I have "never" experienced a shock off my
large 12.75 cardboard sonotube form secondary and have run it in all climates,
including extreme low humidity days back in MN. Plastic (especially nylon and
similar materials) are very sensitive to electrostatic charge. Although I am
not a physics guru, I have had 10 years hands-on experience with static charge
problems in the printing industry. On many occasions, I was directly involved
to investigate electronic ghosts. I learned from hard won experience to carry a
meter designed specifically for measuring static field charge. Because nylon
was common, I could pin point the problem immediately. The static charge levels
would peg the needle (over 40kv) with nylon everytime.
Some of the materials used for secondary forms may contain similar properties
as nylon. With the nylon, the charge mechanism was low humidity and friction.
Our coils may use some other mechanism to provide the charge, but I think David
may be correct as to "what" the secondary form is made of.
Bart
Tesla list wrote:
>
> Original poster: Tesla729-at-cs-dot-com
>
> Hi all,
>
> I've been observing all of these different comments regarding the obvious
> electrostatic phenomena of the sec. coil surface and there is really little
> that I can add. I have indeed experienced this effect myself in the past a
> few times and it does seem like, to the best of my knowledge, that it al-
> ways involved plastic PVC pipe as the secondary form material. With my
> very limited formal education in physics, I will not even venture to give any
>
> theoretical explanation for this efffect. I do know that with my large "Med-
> usa" Tesla system, which has a 12" dia. concrete from, cardboard tube as
> the secondary from, I do not notice this effect, but don't ask me for a logi-
>
> cal explanation! IMHO, I don't think anyone really knows for sure the rea-
> son for this, but most ot us coilers, w/ more than a few weeks experience,
> certainly know that this "strange shock" phenomena DOES indeed exist
> and also know that it is NOT in our immagination!
>
> Take care,
> David Rieben