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Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Hollmike-at-aol-dot-com>
The most impressive coil I have seen in action to date was 'Big Bertha'. This
coil was demonstrated every Saturday at the Tesla museum in Colorado Springs.
I kick myself for not gleaning the specs on this coil, but I will try to
I am sure this coil was designed and built in the old quarter wave days. It
was powered by a pole pig, but I don't know a thing about the input power. The
secondary was about 3 feet in diameter and maybe four feet tall. I don't think
it was made with magnet wire. It may have actually had the cloth or silk
insulation. The topload was a mere 6 inch sphere with two sharpened rods for
The entire room this coil was demonstrated in was a faraday cage. The walls
were lined with sheet copper.
What was impressive is that this coil produced power arcs of at least 10 -
12 feet in length, but were nothing like any coil I have seen since. They were
very thick, white-hot arcs like nothing I've seen since. The arcs seemed much
'thicker' than any I have seen since.
Now this coil may not compare with Bill Wysock's, but then again, it
might. I should have made an attempt to buy it when the museum went
I guess what I am trying to convey is that this coil was designed and built
many years before the list came to be. Bill might know more about it since he
was a member of the International Tesla Society as well and gave lectures or
demos in those days.