# [TCML] 135ft arc 3ft sphere - Possible?

nancylavoie at comcast.net nancylavoie at comcast.net
Thu Oct 1 07:28:04 MDT 2009

```I'd be the last person to argue if the rumored arc lengths of Teslas project were attained or attainable,but I can't help but return to the thought that he was in Colorado to perform research in power transmission and not there to play around with the production of sparks!You must remember that us hobbyists are building and using these things far differently than was intended by Tesla. Just the way I look at it.  Wyatt
Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Stephen Hiscock <stephenhiscock at yahoo.com>

Date: Thu, 01 Oct 2009 15:43:38
To: Tesla Coil Mailing List<tesla at pupman.com>
Subject: Re: [TCML] 135ft arc 3ft sphere - Possible?

Hi there,

It is implied by  DC Cox and Richard Hull it seems that the spark length
of 135 feet is a myth?
well just a question regarding this spark length...
What has terminal size got to do with how far a spark will go?
I'm not saying Richard Hulls analysis is wrong, but doesn't power
ultimately determine spark length?
Wouldn't a 3 feet sphere ONLY determine the initial break out voltage?

Heres what I found already posted on this list on 8 june 2003 and AGREED
upon by many people:
subject: spark length vs. power input
Sun, 08 Jun 2003 21:35:53 -0600
Original poster: "Dr. Resonance by way of Terry Fritz
<teslalist-at-qwest-dot-net>"
[.....snip
d = k' * sqr p
where d - spark length in inches
k = coil factor - from 0.5 to 2.0 (for most coils)
p = input power in watts

k' is dependent on the dia. of the sec. coil as follows:
k' = 0.85 when sec. dia. is 3-10 inches (small coils)
k ' = 1.0 when sec. dia. is 11-16 inches (medium coils)
k' = 1.3 when sec. dia. is 17-20 inches (large coils)
k' = 1.7 when sec. dia. is 21-36 inches (very large coils)
k' = 2.0 when sec. dia. is 37-48 inches (super coils)
.... end of snip]

so from the above snippet and calculations a spark length of 135 feet
from Tesls coil is VERY REASONABLE
and certainly within the accepted range of spark length, power input and
coil k

ie power levels from 500 Kilowatts up to 2 Mega watts for k between 1 &
2 and if his coil had a k bigger then he only needed a small generator
perhaps 50 kilowatts.
But we know tesla had a big generator of perhaps this much power - I
couldn't find a reference but I'm sure it was 2000 horse power -- which
is easily big enough

Am I missing something?
WHAT IS WRONG WITH 135 feet?

cheers..

DC Cox wrote:
> This is a great book.
>
> Rich did a tremendous amount of analysis work on Tesla's work.  Rich
> provides clear explanations and offers some educated insight into what Tesla
> may have been thinking as he conducted his famous experiments.  Rich also
> negates some myths that were spun in the book, Prodigal Genius, especially
> the 135 ft. long sparks off a 3 ft. dia copper sphere.
>
> Glad to see it for sale again.
>
> D.C. Cox
>
>
>
>
> On Tue, Sep 29, 2009 at 12:44 PM, Richard Hull <hullr at whitlock.com> wrote:
>
>
>> It has been a long while, but I am signing back on to alert anyone
>> interested in my expanded book,  "The Tesla Coil Builders Guide to the
>> Colorado Springs Note of Nikola Tesla", is back in print and is being sold
>> by Electric Spacecraft Inc. ,by agreement with me.
>>
>> I am told by them that the book is to be priced at \$35.00 plus \$5.00
>> shipping.
>>
>> I constantly get requests for this book which has been out of print and
>> have had to turn folks away.  It is now back in print.
>>
>> You may contact them directly at  www.electricspacecraft.com<
>> http://www.electricspacecraft.com>
>>
>> Richard Hull
>> _______________________________________________
>> Tesla mailing list
>> Tesla at pupman.com
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>
> _______________________________________________
> Tesla mailing list
> Tesla at pupman.com
> http://www.pupman.com/mailman/listinfo/tesla
>
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