Re: Mysterious Streamers (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 23 Aug 2007 21:22:15 -0500
From: BunnyKiller <bunnikillr@xxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Mysterious Streamers (fwd)

Hey Dave...

Think about arc lamp ( sodium vapor, mercury etc... and laser 
applications...) most of which usually include just one diode ( alot 
like MOTs leaving a 60 Hz pulse) a fully rectified would allow the 120Hz 
flash to occur... but then again who knows...  maybe the first half of 
the second  (of the total 1 second time of exposure)  was dedicated 
towards the flash and coil picture and the second half of the exposure 
time caught the 50% of the arc lamps exposure time leaving the 60 
pulses... we could both be right in this situation depending on the 
power supply of the street lamps... 

just a thought..

Scot D



Tesla list wrote:

>---------- Forwarded message ----------
>Date: Wed, 22 Aug 2007 11:08:03 -0400
>From: Dave Pierson <davep@xxxxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: Re: Mysterious Streamers (fwd)
>
>
>  
>
>>So...  the possibility of the situation is ... 4 sodium vapor lamps of 
>>which 3 are in the distance, the flash captures the T-coil, shutter 
>>remains open for X amount of time after the CCD ( or film) records the  
>>initial image. Once the photographer "took" the picture, the camera was 
>>moved towards the right and then upwards with increasing velocity ( thus 
>>causing the spread out flashes in the "streamer" ( which are more than 
>>likely the 60Hz pulses in the street light).
>>    
>>
>    Largely concur.  The pulses would be at 120, as both positive &
>    negative would provide a light peak.
>
>    As to the appearance of passing in front of the 'toroid', that could
>    easily be a 'double exposure' effect.  They can be quite mystifying.
>
>    best
>     dwp
>
>
>
>
>  
>