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RE: 2 stage TC possible? (fwd)
---------- Forwarded message ----------
Date: Mon, 24 Sep 2007 14:40:21 +0000
From: Jeff Behary <jeff_behary@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: 2 stage TC possible? (fwd)
Marko,
In the July 1919 article, Tesla shows one form of coil specifically designed to do that:
Magazine article:
http://www.electrotherapymuseum.com/2006/ElectricalOscillators/index.htm
Published article:
http://www.electrotherapymuseum.com/TeslaArchive/ElectricOscillators/index.htm
"Fig. 5 shows a later form of transformer principally intended to replace Rhumkorff coils. In this case a primary is employed having a much
greater number of turns, and the secondary is closely linked to the same. The currents developed in the latter, having a tension of from
10,000 to 30,000 volts are used to charge condensers and operate an independent high frequency coil as customary."
As for rectifiers, check out this Kinraide UK patent:
http://www.electrotherapymuseum.com/2005/0PatentsTBK/pages/GB190112408-11.htm
Its a variation of the point-plane rectifier, and uses torroids with flat tops combined with heavily shielded points.
A variation of this patent was filed in the US:
http://www.electrotherapymuseum.com/2005/0PatentsTBK/pages/000676583-1.htm
With a further variation here:
http://www.electrotherapymuseum.com/2005/0PatentsTBK/pages/000689199-1.htm
I believe this is the first time torroids were used with Tesla coils, although for a slightly different
purpose than topload capacity alone. It wasn't until the 1960s that Bill Wysock developed this
idea further into the standard we know today.
I made a spark gap with this principle just as a curiosity:
http://www.electrotherapymuseum.com/2007/ExtensionlessPointLimitlessPlane/index.htm
Movie:
http://www.electrotherapymuseum.com/2007/ExtensionlessPointLimitlessPlane/EPLPMovie.wmv
Getting this idea to work is easier said than done, and requires the coil to operate slowly with respect to the charging and discharging of the cap.
(Same principle carries on to induction coil experiments too). Its a bit easier to do with "kicking coil" circuits, but can be done with transformers too.
The discharges were like a normal Tesla Coil until the current was lowered and gap opened to the point where it fired only about once a second.
In the movie above, this happens at about 15 seconds into it. The "pow...... pow....... pow" sound would produce highly branching discharges that were a bit painful if taken to the body even with a metal rod held in the hand. They were not pure DC, but they were similar in many respects to sparks
produced from a static machine in sound and appearance, and very different from the sparks normally produced if the circuit was operating as a normal
Tesla Coil.
The sparks are too difficult to photograph with the camera, but show up nicely on film:
http://www.electrotherapymuseum.com/2005/2005-06-23/images/CencoDC0000i.jpg
This is a point that is very difficult to appreciate without seeing it in person. In the videos you hear a spark that sounds different, but you can't really see the
difference. In person, with the lights off, you can see surprising details such as those on the photopaper and films, they are easily seen once your eyesare adjusted to the darkness of the room. I've tried every attempt to photograph this (literally hundreds of photos) with no success whatsoever.
(The only thing I can say is that if you've ever operated a large static machine in complete darkness and tried to photograph it you'll understand what I mean. Lichtenberg figures help out tremendously to study these effects, and we have hundreds of examples on the site in the Kinraide archives, new and old)
I later tried this with a normal spark gap, and found that the same effect could be produced with large coils operating at low voltage and low currents with the spark gap opened as wide as possible...
Movie of Tesla coil giving static like discharges:
http://www.electrotherapymuseum.com/2007/KinraideStaticEffects/KStatic.wmv
Page description:
http://www.electrotherapymuseum.com/2007/KinraideStaticEffects/index.htm
In this last example, the output dischargers of the coil seemed to produce both positive and negative discharges at the same terminal yetvery distinctive from each other.
http://www.electrotherapymuseum.com/2006/SnakesPaper1/images/Snakes0000i.jpg
You can get a branching crackling positive spark with a surrounding negative plume discharge. The odd qualities of the dischargesseparates them from static discharges however. They aren't red nor violet, but more of a pale blue-white. (?) They issue from eitherdischarger of the coil, but can be made predominately more positive or negative if the discharger is plane- or point- shaped... (?)
The effect of the same terminal producing distinctly different discharges can be seen if you operate a secondary coil with two primary coils operated from different types of circuits (ie, transformer-spark gap & kicking coil). Somewhere I have a film of this but can't find it. My site is too unorganized even for me to navigate it.
The discharges also have the ability to charge a leyden jar or to electrify insulators placed in their vicinity. In the case of charging a leyden jar,
the jar had to be placed with one terminal either inside of the thread-like negative streamers or within sparking distance of the positive streamers.
Jeff Behary, c/o The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com
> Date: Sun, 23 Sep 2007 19:56:31 -0600> From: tesla@xxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: 2 stage TC possible? (fwd)> > > ---------- Forwarded message ----------> Date: Sun, 23 Sep 2007 21:01:16 -0400> From: Marko Ruban <Marko@xxxxxxxx>> To: Tesla list <tesla@xxxxxxxxxx>> Subject: 2 stage TC possible?> > Just curious, if anyone knows of or thinks it's possible to have a Tesla > Coil driven off the output of another Tesla Coil?> > In other words, have the output off the topload of first system be used > in place of the NST for the second system. Would just tapping into the > output alter the coil's frequency enough to keep it from reaching resonance?> > And another, possibly related, question... is there a simple (cheap) > method of rectifying the TC output current, to make it DC?> > >
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