Re: tesla's colorado lab

["Gomez ADDams" <gomez-at-netherworld-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

on that fateful day 8/11/00 7:18 PM, Tesla list uttered:

> Original poster: "Ed Phillips" <evp-at-pacbell-dot-net>

> The inductance is easily calculable from the coil dimensions, which can
> be scaled from the photos.

Or simply read right out of the CSN.  ;)

>  I believe that the CSN includes some
> calculations of inductance and reasonant frequency (maybe period or
> wavelength).

285,000 cm was the amount of inductance mentioned for the two turns of the
primary.  I was just looking at that section that discussed the second
(cylindrical) primary/secondary form.  I don't immediately see the
calculated inductance of the secondary, but I know it's in there- I just
don't have time to look for it because I'm on my lunch hour.
 
> For example, a coil 30 feet in diameter and 15 long, wound with about
> 30 turns, has an inductance of the order of 10 millihenries, large but
> not enormous.

Those dimensions don't match anything I remember in the CSN.  The second
pri/sec form was about 49 feet wire-to-wire diameter, I can't find the
height, but the initial set up (of the second form) had grooves on about 1 -
5/8" centers "with provision for 49 turns", so you can probably figure out
the secondary inductance from that.

Secondary was wound with #10 B&S (=AWG) gauge, primary size is not
explicitly called out in the section I'm reading, but is implied, and is
discussed vis-a-vis his desire to have the total amount of copper in
secondary and primary to be equivalent.  From this, it appears that the
total circular milss of the primary (two turns) is approximately 490,000,
which would imply a wire size of greater than 0000 or "400MCM"!

 Heavy primary conductors indeed.  When I get a chance, I'll see if I can
find the actual primary wire size noted directly.

- Gomez


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