Re: CONCERTINA CAP

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

Original poster: "Crow Leader by way of Terry Fritz <teslalist-at-qwest-dot-net>" <tesla-at-lists.symmetric-dot-net>

If you are worried about inductance of a rolled cap, you can just wind it
extended foil style. Have the edges of the foil or metal stick out on both
sides way past the dielectric. You can them bolt them together eliminating
current from having to spiral around inside your cap to get to the
terminals. It's a bit harder to wind a cap this way, but makes for solid
terminations. My homemade caps tended to fail by the insert tabs used to
terminate the internal foils.

KEN

On Tue, 8 Jul 2003, Tesla list wrote:

 > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
<IanHelixsp-at-aol-dot-com>
 >
 > First of all hello everybody, this is my first correspondence to the 'list'.
 > I am in the process of building my first coil (4 1/2") and after 
searching the
 > W.ibbly W.obbly W.ay I discovered this fantastic information resource. I was
 > amazed to see so many 'insane' people out there with the same inexplicable
 > fascination with electrical discharges. Perhaps I'm not that mad after all?
 > Anyway I'll get to the point. With respect to rolled caps having self
 > inductance
 > and long discharge paths, I was wondering about folding i.e. a 
concertina cap.
 > I know that the effective capacitance would be half that of a roll for a
 > given length of material, but the discharge path would be very short and
 > very low
 > resistance (one could run the bus-bars right along the exposed ends or 
loops.
 > The reason behind my thinking is as follows. I work as a buyer for a roofing
 > company and we carry large quantities of self adhesive allu. flashing and
 > rolls
 > of thick (up to 2mm), poly roofing membrane, p.v.c. pipes of all diameters
 > etc. so my plan was to burnish down the allu flashing to the poly membrane
 > excluding all the air. Then when folded the only place air can be trapped is
 > between plates of the same polarity. Why not just build a stacked plate
 > cap? I hear
 > you cry, well.....I am I just thought this would reduce production time and
 > make it easier to exclude air. It's just a thought.
 > Any comments anyone?
 > Also I don't seem to be able to find any detailed info on d.c. resonant
 > charging or magnifier coils and I'm struggling to find a suitable
 > transformer as
 > nst's are limited by law in the u.k. to 10kV -at- 60mA and also have internal
 > trip
 > switches for earth leakage and or short circuit (or so I'm told by 
somebody in
 > the industry), pole pigs are very rare. (except those 33kV jobs that 
weigh as
 > much as a car and cost as much as a house!) I know I can series two 
mot's but
 > that's still only 4kV.
 >
 > Ian D, Liverpool, U.K.
 >
 >
 >