Re: The Next Coil

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Sunday, August 03, 1997 12:49 PM
To: 	Tesla List
Subject: 	Re: The Next Coil

John Freau wrote:

> > Hmmm...  It's true that the '3 phase - sync gap - 360 BPS' system would
> > have a better power factor, but such a scheme would require three
> > primary capacitor banks and a rather novel commutating arrangement on
> > the rotary gap.  I wrestled with this design choice on my present coil,
> > and decided that a diode set would be easier to deal with than three
> > primary capacitor banks and a three phase rotary gap.  It's also very
> > convenient to control the thruput power using the rotary gap speed,
> > which eliminates the need for high power variacs.
> > -GL
> I was thinking in terms of using just one capacitor bank and a regular
> sync-gap...I didn't realize that 3 cap banks would be needed.  The
> sync-gap would have 6 electrodes instead of the normal 2, to handle
> the 3 phase...am I missing something?  I seem to remember that
> someone tried this (maybe Tesla?) and it worked well.
> I agree with you about the ease of power throughput adjustments...that's
> one of the disadvantages of any sync-gap.

You'd have to draw that one for me.  I can't visualize how the single 
cap bank can be charged evenly from the 3 phases, without using diodes.

Did Tesla ever use 3 phase for powering his coils?