Tex, When I was young, there were sun or son oscilloscopes used to look at the spark pattern coils produced. The LC circuit does produce a hi frequency dampened wave. I can't remember, but there are about 10-15 cycles it goes through, not just one spark, lasts microseconds. So the spark is alternating current. I can't find where I read about the LC tank circuits in coils, I'm thinking internal capacitance makes up a parallel tank and the condenser is part of the series LC tank. But the frequency of the AC is determined by the built in capacitance, just like radio electronics.
Really no big deal one way or the other. Nice chat. Geo
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