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RE: [TCML] Rectifying A Tesla Coil: Point-Plane Collector Experiments -works!
Jeff -
Another old book to watch for:
A Photographic Study of High Voltage Discharges
By Roscoe Henry George, Kary Boyer McEachron, Kirk Augustus Oplinger
Published by Purdue university, 1924
This might provide some interesting insight into unusual appearing electrical discharges from Tesla coils.
Regards,
Herr Zapp
--- On Wed, 9/3/08, Jeff Behary <electrotherapy@xxxxxxxxxxx> wrote:
From: Jeff Behary <electrotherapy@xxxxxxxxxxx>
Subject: RE: [TCML] Rectifying A Tesla Coil: Point-Plane Collector Experiments -works!
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Wednesday, September 3, 2008, 3:25 PM
Peter -
More photos to come. But here were some quick tests done tonight:
Two more spheres made, placed insulated from the original two. Again, one with
a point, and one a plane. This time the spheres were again opposite the
originals - the sphere with the plane electrode now had a pointed sphere in its
vicinity, the pointed sphere had a plane in its vicinity. (2 - 3" away,
again on PVC pipe as standoffs)...(just to clarify, bipolar pancake coils, point
and plane discharge electrodes respectively, insulated point and plane
"collectors" or "rectifiers" suspended above the coils on
PVC pipe insulators, and two additional point and plane sphere
"collectors" insulated from those.
1. Twine, rope, and threads stood on end on either of the latest spheres. A
cat feather toy also vibrated a lot on top of the spheres, but were too rigid to
distort upwards.
2. A small 3/8" brass ball suspended from a thread would attract and
repel between the spheres. What was curious about this, is that the ball hit
one sphere (lets say, the left sphere), repelled about an inch, and then
attracted again to the same sphere; next it repelled further (3 inches away) and
touched the right sphere. Repelled an inch or so, and again was attracted to
the right sphere. Next time, it repelled all the way, to the left sphere, and
repeated the process. It could be that my ball wasn't mounted very neatly
to the thread (it wasn't!), or the current was erratic but at similar
intervals. Probably both.
3. Strong static effects could be felt near the "positive" sphere.
Little was felt near the negative sphere, unless the positive sphere was grasped
or approached, then static effects were felt from both spheres.
4. The most static like sparks were from the recent set of insulated spheres,
when the points and planes did not spark directly to them but rather have a
brush discharge not quite within sparking distance. The sparks between the
latest spheres were 1 - 2", rather painful when taken to a piece of metal
in the hand. They were very distinct in colour, bright, white, straight, and
fat near the negative sphere, thin, reddish-purple and more thread-like near the
positive sphere. These sparks could be increased in size when the two recent
spheres were placed within sparking distance of the originals, but the sparks
began to look gradually more erratic (dashed lines, or uneven portions of violet
and white sparks) as the spark length was increased to 3 - 4" or so.
5. Doorknob caps (40kV) routinely held charges when placed on top of the
recent spheres. Unfortuantely, I screwed up two of them in the process too. I
need to make a pair of Leyden jars and do it properly! But a 3/16" spark
or so could be discharged from either one, showing the caps were charged, and
retained the charge after powering down.
6. I disagree with your wording of "Failure" with that test on your
site. If you can charge a cap, or show an electrometer of sorts working, it
wasn't a failure. Maybe it wasn't efficient, but still a lesson
learned, right?
I think with some more experimenting, it might turn somewhat efficient. Even
if not, it will be an interesting approach to a static machine for 99.9999%
humidity... I'm not saying there isn't a more efficient way, either,
but for the moment I like the idea to start from the beginning and seeing what
happens from there...
7. The sparks when things are erratic are really interesting in appearance.
For me, this makes the test worth while. They are unlike any other I've
seen from any machine.
http://www.electrotherapymuseum.com/2008/PointPlaneCollectors1/StrangeSparks3.jpg
This in person was really bizarre!
Jeff
>
> I am not sure how you are showing rectification here. You have no method
to
> indicate DC like an electrometer or charging a capacitor or object. And
once
> a spark forms, the rectifier is short circuited.
> Here is my TC rectifier with electrometer for what it's worth.
> http://tesladownunder.com/Failures.htm#RectifyTC
> Peter
>
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