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Hi Mick,
"Interesting I have not found patent of Teslas magnetic spark gap but the description and drawing are available in The inventions, researches and writings of Nikola Tesla by Thomas Commeford Martin. There also seemed to be magnetic vacuum rectifiers build for a short spell but have not found much more about these interesting claimed devices that the occasional mutterings"
The Poulsen arc was the kind of arc transmitters used until the invention of tubes. Here is Valdemar Poulsen's patent (US789449) which use a flame and magnetism to control the arc: https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=789449A&KC=A&FT=D&ND=1&date=19050509&DB=&locale=en_EP https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=789449A&KC=A&FT=D&ND=1&date=19050509&DB=&locale=en_EP#
Wikipedia article: https://wiki2.org/en/Arc_converter https://wiki2.org/en/Arc_converter
From the Wikipedia article:
Duddell arc (and other early types) In the first type of arc oscillator, the AC current in the condenser i0 is much smaller than the DC supply current i1, and the arc is never extinguished during an output cycle. The Duddell arc is an example of the first type, but the first type is not practical for RF transmitters.
Poulsen arc In the second type of arc oscillator, the condenser AC discharge current is large enough to extinguish the arc but not large enough to restart the arc in the opposite direction. This second type is the Poulsen arc. Quenched spark gap In the third type of arc oscillator, the arc extinguishes but may reignite when the condenser current reverses. The third case is a quenched spark gap and produces damped oscillations.
https://www.electronics-notes.com/articles/history/spark-gap-transmitters/poulsen-arc-transmitter.php https://www.electronics-notes.com/articles/history/spark-gap-transmitters/poulsen-arc-transmitter.php
http://ethw.org/Milestones:Poulsen-Arc_Radio_Transmitter,_1902 http://ethw.org/Milestones:Poulsen-Arc_Radio_Transmitter,_1902
The history of Tesla's spark gaps and arcs: https://waveguide.blog/teslas-spark-gaps-literature-review/ https://waveguide.blog/teslas-spark-gaps-literature-review/
After the spark gaps and arcs came the tube era. Tesla used tubes too according to the story from his nephew about the ride in Tesla's electric car.
Regards
Ole
---In [email protected], <mkjekyll@...> wrote :
Norm,
Great stuff on the VTA. Always found it suspicious that after the Scientific American released the time reversed light article that all slid into obscurity. We should be using these mirrors for satellite communications and all sorts of other applications but no. Seems that maybe wireless power is in the same boat as it should have been widely applied by now with all the carbide fets designed just for this purpose, could it be that loose coupling an off the shelf wireless power device might give away the candy store...
I am very interested in the device you posted about for fire control. Unfortunately your posts are not parsable by subject matter. Do you think this application has potential for forest fires and if so what is required to build a prototype? From the brief description available it appeared to be some sort of air pump connected to a neg ion source. Do you know the size of the generator used for fuel fires you mentioned? Is just a series of 15 kv diode rectified flybacks sufficient or are more relativistic voltages employed/required? Interesting I have not found patent of Teslas magnetic spark gap but the description and drawing are available in The inventions, researches and writings of Nikola Tesla by Thomas Commeford Martin. There also seemed to be magnetic vacuum rectifiers build for a short spell but have not found much more about these interesting claimed devices that the occasional mutterings.
I know you also mentioned that some Tesla coils can produce this effect so is this a matter of timing of a rectified primary? Need to get my thyratron up and online, so many chores and so much to build.
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