RE: Spheres vs Toriods


The sphere is obviously the better terminal for voltage buildup, but it 
offers zero electrostatic shielding or shanding of the top of the tesla 
coils resonator.  It is not stackable or attachable to a lot of systems 
without boring holes in it.  As you say, it is the most expensive form of 
terminal to spin and weld to perfection.  All of these points add up to the 
sphere actually being the worst terminal for a Tesla coil.   The fact that 
the sphere or some form of oblate is both theoretically and in actuality the 
ideal terminal for voltage standoff, doesn't mean beans if the coil hasn't 
the proper shielding and field shaping to survive the rise of voltage that 
the terminal can actually store.

The tesla coil is a form of pulse charged electrostatic generator or charge 
pump when very large terminal capacities are used.  This capacitance seems 
to be best developed in Toroidial termnals provided large cross sectional 
diameters are used.  The superb field shaping action and stackability of the 
toroid shape makes it the number one choice for Tesla coils.

Richard Hull, TCBOR
From: tesla
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Subject: Spheres vs Toriods
Date: Wednesday, April 03, 1996 8:05PM