The first group of pictures shows the coil in action with the NST power supply.
Click on a thumbnail to see a larger version. These were taken with an HP C500 digital camera, mounted on a tripod and set to keep the shutter open as long as possible.
A little closer view . . .
These two shots were captured from an analog video that I recorded. One shows a strike to a ground rod from a breakout point, taken while I tested the maximum distance I could achieve (44.5"). The other shows the only strike to the strike rail that I observed during over two hours of run time. Scroll down for a brief MPEG file that shows both strikes in real time.
These images were also captured from video and show some closer views. One difference between the digital camera and video is clear. The digital camera does not do justice to the intensity of the streamers.
Up close and personal. More captures from some zoom video shots.
This animated GIF contains 67 captured frames from over 20 minutes of video. It provides a nice summary of what the coil can do. The GIF is big (2 MB) and could take a while to load with slower connections.
There really is no substitute for seeing it in real time. If you have the bandwidth or a lot of patience, take a look at these three MPEG files. They work for sure with the Microsoft Media Player (I've had problems getting them to run in Real Player or Quick Time. YMMV). Click here to load the files.
This next set of photos shows the coil's performance with the 4-MOT supply. These were taken with the HP C500 digital camera, mounted on a tripod and set to keep the shutter open as long as possible (about 2 seconds). What you see here deviates some from the actual view. The slow shutter produces the "wavy" appearance because the streamers are able to sweep across a good part of the viewing field during each photo exposure.
Here are a couple of recent shots (2004) of the coil with a new spun aluminum topload and powered by the 4-MOT supply. The first picture was taken with a Sony digital camera using manual settings (ISO 400, F2.1, 8 second exposure). The second picture was taken with a Canon 35mm SLR camera (ISO 400 , F1.8, 2 second exposure).