[TCML] Safety Gap Construction

["Nicholas J. Goble" <ngoble@xxxxxxx>]

How do I construct a safety gap?  From what I see, it's just three 
brass balls.  The middle one is grounded and the end two are connected 
to the transformer wires.  Please correct me if I'm wrong.

I only have two questions:

1) Where can I buy brass balls? I've looked on the internet, but I just 
can't find any.  Or maybe I don't need brass balls at all.  Is there 
some other way I can construct a safety gap?

2) How can I determine the spacing of the balls? Is there any formula 
to calculate the gaps, or should I just guess?

Thanks again.

Nicholas Goble
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