That's an interesting suggestion Leolaia, except that the more I watch mythbusters the more I am critical of their design prowess - not that I am not a monkey with a wrench myself. Recently I have discovered some of the videos from "BRAINIAC - SCIENCE ABUSE" that are out on the web. The Brainiac video on the alkali metals is way beyond anything the mythbusters would do. Check it out!
...but I digress.
Sinis, the charging of a leyden jar - in fact, any capacitor - can happen simply by the nature of it's construction. The ark would draw electrons from it's environment and they would continue to accumulate until the charge was dissipated, either with a snappy arc to ground or a slowly glowing shekinah light (corona effect).
James_Woods, yes, there are some electrical considerations, and the device could be potentially lethal. I have worked with commercial flash units in the past - units that used two 20"flash tubes in series, and I am here to tell the tale. One of the stories from the days of yore when this equipment was being engineered was that these flash units would be demonstrated by placing a hot dog across the output terminals of the flash power supply and throwing the switch, at which time the hotdog would VAPORIZE.... LOUDLY!
A corona effect can be created in free air at sea level with less than 2000 volts. This capacitor will probably be able to easily exceed that voltage. Speaking of voltage, did you know that when you jump a spark to a doorknob in winter you are discharging at least 600 volts?
Seeing the violet corona effect: It helps if the observation area is dark.
Hey!
The "holy of holies" in the tabernacle was a pretty dark room, wasn't it? I wonder if it smelled of ozone?
I don't recall anyone saying they saw the shekinah light in broad daylight. There was the "cloud effect" and I'll admit I don't know what that might have been. Maybe if we get this thing built we can find out.