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RE: [TCML] Primary selfC
Bart -
I am digging and digging to try and find it for you. I have a 3" thick binder of non-Tesla Tesla Coils from 1890s - 1940s. I can't find it, and hope I actually printed it out. I think I got it from the European patent office, which was up until a few years ago easier to search than the US Patent Office...
I found a few interesting ones while thumbing through it...
HERBERT HADDAN patented several portable bipolar Pancake Coils...very strange! He pushed both Pancakes nearly side by side, outermost turns in series, but instead of two primary coils, he wound one long primary around both with it squashed in the middle to form a strange figure 8, with the middle portion not touching... This from was 1905, UK Patent No. 17,308.
FREDERICK FINCH STRONG - US Patent 775, 870 - A complete Tesla Coil 4x4x5". The transformer is an open core variety, the condenser is a rolled cap rolled on top of the transformer secondary, an insulating tube wound on top of this with copper ribbon wound flat for a primary coil, and on top of this a secondary coil in a single layer that lead to two spark posts on top of the box. The spark gap in on the side of the box, the whole thing poured with wax. Really strange, but clever.
JAMES SEELEY - US Patent 834,496 - Tesla Coil Arc Light - for UV Production - Uses a Pancake Coil made with copper ribbon for both Primary and Secondary Coils. (I have the X-Ray coil equivalent - the ribbon gives the spark some real capacity to the discharge - its mean, at full power the sparks change from violet to yellow-orange!)
(one of the neatest Tesla Coils ever:)
H. P. PULLWITT - US Patent 1,780,600 - Electrotherapeutic Machine - Known as "The Hogan", a floor model Tesla Coil that used a main tank circuit for 3 separate high frequency coils. Uses a 20kV transformer at nearly 2 KW. Has an upright Tesla/Oudin Coil, a vertical Pancake Coil, and a d'Arsonval Coil for inductive heating and various effects. 16 pages! These machines really do perform!
GEORGES EUGENE GAIFFE - US Patent 877,319 - 1908 - Transformer employed in high frequency circuits - A famous inventor of both high frequency and low frequency X-Ray machines in france. Gaiffe used liquid resistances and condensers to form a safety filter to protect transformers from high frequency currents. He employed transformers of from 60 - 100kV to power his coils, and his machines were famous for not burning out (nearly every early X-Ray books mentions him, even though the machines were only sold in France!). He made a Terry-filter predecessor!
Also its interesting that a lot of coils in the early 1900s focused on the timing of circuits, circuit breakers, kicking coils, etc. Some times there were relays to control exactly when a condenser was charged and discharged through the Tesla Coil, or times when multiple condensers were used, one of which was only in the charging circuit periodically... other times there were DC powered coils, or AC/DC powered coils, or AC coils that had syncronous interrupters...Some were patents that dwelled on little differences in circuits that seemed to make big difference in the output (at least to the inventor!). While many were just attempts to patent something that was patented a million times already, some were genuinely unique. Deciphering them into something practical is another matter...
Jeff> Date: Sun, 27 Jul 2008 20:35:40 -0700> From: bartb@xxxxxxxxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: Re: [TCML] Primary selfC> CC: > > Hi Jeff,> > Hey, if you dig up the patent mentioned, I would be interested in reading.> > Cheers,> Bart> > Jeff Behary wrote:> > Once I saw an early patent, I will have to dig to find the number, but the primary coil of the Tesla Coil was wound with two ribbons in parallel separated by a dielectric to form a condenser. The number of primary turns was calculated such that it matched the capacity of the condenser needed for resonance in the circuit.> _______________________________________________> Tesla mailing list> Tesla@xxxxxxxxxxxxxx> http://www.pupman.com/mailman/listinfo/tesla
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