Re: New Inductance Formula

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

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "David Thomson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <dave-at-volantis-dot-org>
> 
> Hi Ed,
> 
> >Wheeler's formulae (there are several) are usually known as Wheeler's
> approximations, and were developed during "slide rule days" as a convenient
> and simple tool for radio engineers, who seldom need an accuracy of as great
> as 1%.
> 
> Wheeler's formulas have served us well for quite a while.  I'm not disputing
> that nor am I disrespectful of his contribution.
> 
> >Quite recently a guy named Lundin (?) worked out fairly simple expressions
> giving an accuracy of better than a part in 300,000.
> 
> I'd like to see that formula.  If you or anyone else knows where to find it
> please post it to the list.
> 
> >By the way, I believe the dimension of inductance is indeed length,
> (centimeters in the old cgs system) though don't have time to look that up
> right now.
> 
> The dimensions of inductance in the MKS system are kg*m^2/coul^2.  In the SI
> system it is kg*m^2/s^2*A^2.  In the cgs system it is sec^2/cm.
> 
> Dave

	Well, I "looked it up" and now agree with you on SI units.  Will have
to look in the books at work to see what they say.

Ed

P.S. Will post Lundin's approximation when I can find the file