Re: [TCML] 5" Sparks - Approx 35 watts input power: Tesla was correct!

[Ed Phillips <evp@xxxxxxxxxxx>]

John,
My point of this was a while back when everyone was getting fed up with the "wireless transmission" posts.My argument was in general to try and recreate some of Tesla's work that is achievable - like anefficient table top coil as those Tesla made in the 1890s.  There was a lot of neat patents and conceptsthat came from that period, and all of them are "on topic" and relating to "Tesla Coil" construction.

The result was more or less a bombarding of posts regarding how authentic Tesla's statements were,suggesting the claims were exaggerated/etc.   Several people mentioned ignition or induction coils withthose efficiencies, which I agree are completely possible, but I am interested in Tesla Coils,resonant circuits with high efficiencies.  Something like we normally build, but low power.I know with your brilliant work in modern Tesla Coil circuitry that for sure these claims are easilyobtained if Tesla could do it with archaic technology.  I would love to see it though from someone,because I think it may offer some interesting designs and creativity.
Its an unusual request to group of people normally making huge sparks.  The 35 watts is irrelevant to me,
I was hoping just to see some responses of low power (less than 75 watts) and efficient Tesla Coils (4 - 6" sparks?) made by people on the list.  As much as there is a fine art in making huge sparks, I think thereis an equal opportunity of creativity in making smaller, more efficient machines too.  Surely something can belearned from it...?

Jeff Behary"

	I'm very much interested in the "technology" of Tesla's era and I hope the subject will be continued.   Jeff mentions a "Rogers" violet-ray apparatus.  Is this the same Rogers as in "Rogers Electric Laboratories Co." of Cleveland, Ohio?  I have a hand-held spark coil by them which is labeled "Model D" with latest patent date of 1918.  Essentially identical to the ones Cenco and others made for vacuum leak detectors except the kicker coil and vibrator are in a wooden box and the actual spark coil is in a hard rubber tube connected by a cloth covered cable.  Works just fine and I've used it for the original purpose.

	I think I've mentioned this before but the same kicker-coil idea was used for both "Wireless Transmitters" [spark gap type] and also signal generators [tuned circuit connected across the contacts of a battery-powered high-frequency buzzer]from before 1910 until WW1.  I have a GR 174B wavemeter made in 1924 which still uses a buzzer to permit it to be used as a signal generator.  There were also transmitters produced for military use which replaced the buzzer with a motor-driven commutato and I would think that configuration would be of interest in guys wanting to build more reliable and higher power kicker-coil powered circuits.

Ed

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