Re: Beading caught on film.

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Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>

Hi Steve,

When I would get a photo of the zero crossing, half of the length or more 
would be dark in the tubes, and the ion accoustic bands were also present 
in the lit half, if in proper position.  The ion accoustic bands are only 
an inch in width.  The spacing of these bands would change with the number 
of turns on the bifilar coils. (9"apart at 45degrees, 10"at 22.5 in 13" of 
lit tube)  The final set of pictures that I took of this experiment were 
with a oscilloscope present in the picture.  You could watch the trace and 
the band position in relation to where the measured spike was 
occurring.  Also all pictures were taken at 1/1000 sec with 1000 speed film.

David E Weiss

> Original poster: Steve Conner <steve.conner@xxxxxxxxxxx>
>
> At 19:04 03/05/05 -0600, you wrote:
>
> > Don't know what it is...
>
> I think it's a length of arc channel that heads directly away from or 
> towards the camera so you're looking right down it. That makes it seem 
> brighter. You wouldn't see that with the eye because you have two eyes and 
> see in 3-d.
>
> On a related note, a while back I saw a post where someone saw two dark 
> bands in a plasma tube (powered by a NST) that he photographed with 1/250 
> sec shutter speed, so assumed that they couldn't be due to zero crossings 
> of the 60Hz. He went on to assume that this was caused by some sort of 
> self organising plasma.
>
> Well I recently found out that this can happen with SLR cameras that have 
> a focal plane shutter. The actual shutter blinds move quite slowly and 
> fast shutter speeds are achieved by narrowing the slit between them. So a 
> given piece of film may only get exposed for 1/1000 sec but it can take 
> 1/60 sec to expose the whole frame. Hit google for an explanation of the 
> focal plane shutter.
>
>
> Steve Conner