Re: D.C. from tesla coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rheidlebaugh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rheidlebaugh-at-zialink-dot-com>

An ion rectifier works on the concept that any surface will hold electrons.
a surface will discharge electrons when the number of electrons excedes the
breakdown potential. So if the area is large it will hold more electrons ,
and if the area is small it will hold less. That is what makes a lightning
rod work. If you put a point inside a sphere it makes a good ion rectifier
because the radius of curve makes the distance constant and the charge
distrabution from the point constant. So the field strength is constant.
When the shape is flat the field strength is not constant and the current
drops off. The useable area of the plate drops off by a square proportion.
If you use a point on the outside of a sphere the effective area is reduced
so the sphere area looks small in relatoin to the point and the current
transpher looks like AC not DC. The total rectifier effect is proportional
to the difference of area. Not the ability to conduct in one direction like
a diode. If the area of both sides is the same then you get AC current flow
just like a capacitor. If the area is different then you get more current
flow in one direction than the other or rectification with some AC rippel.
As a static charge builds up less rippel effect is noted caused by
attraction of unlike charges and repultion of like charges. So the rippel
effect becomes less, but not gone.
  Robert  H

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Fri, 12 Jul 2002 08:05:12 -0600
> To: tesla-at-pupman-dot-com
> Subject: Re: D.C. from tesla coil
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Fri, 12 Jul 2002 08:18:29 -0600
> 
> Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <colin.heath4-at-ntlworld-dot-com>
> 
> thanx for your replys
> so can this be done with a sphere and a point ?
> cheers
> colin
> 
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, July 12, 2002 12:19 AM
> Subject: Re: D.C. from tesla coil
> 
> 
>> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <davep-at-quik-dot-com>
>> 
>>> a lecture by tesla.
>> 
>>>> Another peculiarity of the rapidly alternating
>>>> discharge of the induction coil is it's radically
>>>> different behavior with respect to points and rounded
>>>> surfaces.
>> 
>> 
>>>> If a thick wire, provided with a ball at one end and
>>>> with a point at the other be attached to the positive
>>>> terminal of a static machine, practically all the
>>>> charge will be lost through the point, on accoundt of
>>>> the enormously greater tension, dependent on the
>>>> radius of curvature.  But if such a wire is attached
>>>> to one of the terminals of the induction coil, it will
>>>> be observed that with very high frequencies streams
>>>> issue from the ball almost as copiously as from the
>>>> point.
>> 
>> 
>>> end
>> 
>> 
>> Much has been learned of field ion rectifiers
>> (which is what is being discussed here...) since
>> then.
>> 
>>> He goes on to explain that the round surface disturbs
>>> the air inductively, the air molecules not
>>> necessarily coming in contact with the ball.
>> 
>> 
>> There are no 'air molecules'. tho that is a fine
>> point.
>> 
>> 
>>>> "Also, the larger the ball with a given frequency, or
>>>> the higher the frequency, the more will the ball have
>>>> advantage over the point."
>> 
>> 
>> Is he discussing rectification or ???
>> 
>> best
>> dwp
>> 
>> ...the net of a million lies...
>> Vernor Vinge
>> There are Many Web Sites which Say Many Things.
>> -me
>> 
>> 
>> 
>> 
> 
> 
> 
>