I've been a subscriber to this email service for a bit of time 
now but this is my first ever contribution to it...or at least use 
of it beyond reading material.  I am attempting to build my first 
tesla coil and want to make certain everything goes as well as 
possible.  I have designed multiple spark gaps each of which 
appears to work but I am stuck on a simple question.  How do I know 
when it is "working"  and not just producing an electrical arc  but 
instead a fully charged shot with my entire capacitor behind it.  I 
do not have any tools beyond a physics textbook, paper, pens, and a 
10 dollar voltmeter.  The best simple observations I can gather to 
show that it would be working is when it produces the exceptionally 
loud crack with each firing and that it shoots nice clean blue 
shots across as opposed to the fuzzy orange common of electrical 
arcing.  Is there a better way to know or is that all I have to 
work with without an oscilloscope or more tools. I've done all the 
calculations to find my gap spacing on a few models and made a few 
by trial and error.  Thanks for your help.
Ryan Miller
19 years old - CA
.-= Miller =-.
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