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Re: [TCML] 135ft arc 3ft sphere - Possible?
I never implied that a terminal size has anything to do with spark length.
This just happened to be the size of the elevated terminal used by Tesla.
Yes, the 135 ft spark is a myth. If you carefully calculate all the
factors, as Rich has done in his excellent book, the max spark length
produced by Tesla at Col. Springs was around 38 ft. See Rich's book for the
complete analysis based on power, etc.
On Wed, Sep 30, 2009 at 7:43 PM, Stephen Hiscock
> 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
> 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?
> 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
>> 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@xxxxxxxxxxxx>
>>> 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
>>> 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
>>> 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<
>>> Richard Hull
>>> Tesla mailing list
>> Tesla mailing list
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