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Re: Very High Mutal inductance

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Mddeming-at-aol-dot-com>

In a message dated 5/10/01 8:21:05 AM Eastern Daylight Time, tesla-at-pupman-dot-com 

> Original poster: "Erik Schulz by way of Terry Fritz <twftesla-at-uswest-dot-net>" < 
> gradient-at-mail.utexas.edu> 
>    I was thinking about the old days when I had problems with racing arcs 
> on my secondary.  I was wondering why they were caused.  Is the air breaking 
> down around the coil from the high emf with the help of the pvc secondary? 
> If so the secondary could be immersed into a large bath of oil.  This would 
> prevent arcing along the secondary and allow higher coupling before 
> dielectric breakdown. 
>    By faraday's law we would get a higher emf with the given higher 
> magnetic flux linkage.  So what would be the advantage of this?  I'm glad 
> you 
> asked. :o)  My hope is *longer* more wispy streamers but what would happen 
> if the toroid was increased in size, thereby decreasing the voltage gradient 
> along the surface? 
>    Another thought is since the mutual inductance is increased, shouldn't 
> more energy be transferred per cycle from the primary to the secondary? 
> Which would mean less total current through the spark gap. 
> Just some thoughts, 
> Erik Schulz 
> CS and PHY 
> University of Texas at Austin 

Hi Erik, All! 
        Tesla, in Pat.No.514168 of 6 Feb 1894 q.v., shows a system in which 
the capacitor, primary, secondary, and even a spark gap are immersed in oil. 
The oil bath is cooled by pumping it through a coiled pipe in a coolant 
reservoir ( heat exchanger). The speed of oil flow would determine the speed 
of rotation of the metallic turbine spark gap.