Re: Differences between "bad" streamers and "good" streamers

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

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

Two ways in which you can get a shadow of a spark:
The spark channel is actually opaque
The air is very hot near the channel, which means it has a high index of
refraction, which means that (just like a glass window in air) it can
reflect the incident light.


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, April 09, 2003 4:28 PM
Subject: Re: Differences between "bad" streamers and "good" streamers


 > Original poster: "S Gaeta by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<sgtporky-at-prodigy-dot-net>
 >
 > Someone took a picture of my coil with flash. You can barely make out the
 > streamers. The wierd part is that there was a solid white background in
the
 > photo, and in two of the photos it looks like there is a shadow of the
 > streamers on the wall. That's impossible! Isn't it????? How can something
 > that is light + invisable energy block light?
 >
 > Sue
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, April 09, 2003 5:28 PM
 > Subject: Re: Differences between "bad" streamers and "good" streamers
 >
 >
 >  > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <FutureT-at-aol-dot-com>
 >  >
 >  > In a message dated 4/9/03 4:26:59 PM Eastern Daylight Time,
 >  > tesla-at-pupman-dot-com writes:
 >  >
 >  > > >You must realize that spark gap tesla coil streamers are NOT bright,
 >  > > >I don't care how big and/or powerful your coil is. They are
invisible
 >  > > >with normal sunlight, hard to see in normal tungsten lighting, and
 >  > > >only highly visible in the dark.
 >  >
 >  >
 >  > It is interesting also to consider that many of the sensitive video
 > cameras
 >  > and digital cameras, as well as time exposures using normal film,
 >  > often make the sparks in photos appear thicker and/or brighter than
 >  > they appear directly to the human eye.
 >  >
 >  > John
 >  >
 >  >
 >
 >