Daniel,Yes, his receiving circuits are brilliant, Especially the gas filled tubes with a "gate" wire on the outside that would amplify and rectify RF... Sound familiar ?
The Second spark gap always interested me, I agree the sparks were wasted energy, the cupola was designed to be big enough to (ideally) not break out, allowing a large voltage build up. Of course a large topload would also help to reduce the frequency of the coil itself. One day I may get time to make a small coil with a secondary spark gap and experiment to see if I can get a lower frequency field from it.
I haven't read the Richard Hulls guide to the CSN Notes, but from the CSN Notes itself I thought that he was trying to excite and resonate with either the earth, or what is now known as the ionosphere. Or one against the other. For either to work the frequencies would need to be in the 10's of Hz or a harmonic.
Is there a copy of Richard Hulls notes available anywhere ? Derek On 28/11/2018 20:04, Daniel Kunkel wrote:
Derek, Yes, he had a ton of variations on the magnifier circuit. Some were dedicated to specific testing scenarios he was doing. But in the end, his goal was not to discover how to lower the resonant frequency, but to learn how to maximize voltage. But the voltage was not for spark production (this is why Wardenclyffe had large topload for streamer suppression). The Tesla global wireless system was dependent on large voltages. If you have a copy of Richard Hull's Guide to the CSN Notes, in the Appendix section (on page 192 or 194...I think), he covers how Tesla Wireless was supposed to work and how it is different than radio as we know it today. I do think his receiving circuits (some/all) did employ a spark gap. Thanks, ~Dan Kansas City area On Wed, Nov 28, 2018 at 1:45 PM Derek, Extreme Electronics < tesla@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:Daniel, Total speculation, but I believe Tesla intended to use another spark gap between the tertiary (assuming magnifier) and the top load. I have read references that hint that it is possible to get beat frequencies in the low Hz range using this arrangement, although the system would be running in the Khz. Has anyone tried this ? Derek On 28/11/2018 14:24, Daniel Kunkel wrote:Billy,02 Jan. 1900 (p. 365). Please see the very last paragraph! Teslaintended (time permitting) to build an extra coil for full power of apparatus & take pictures outside! I will have to re-read the 02 Jan entry when I get home tonight, as Idon'trecall that partMy question remains: How could this have been done & what would theresonant frequency be? I believe Hull gives the oscillator's values, so it would be a simple operation to swap in the additional values for the topload to determinetheresultant frequency.And as a follow up, does anyone have an idea what the lowest possiblefrequency is for a Tesla coil / magnifier??? I have also wondered what frequency is the lowest practical/possiblelimitfor a Tesla Coil. At least for a standard AC powered spark gap coil, I can't see it working efficiently below the line frequency* due tochargingthe capacitor and spark gap break rates. Tesla's wireless was going toneedsomething on the 8-11Hz range, so he didn't see a problem with these low frequencies. I think the best way to make that happen would be to run the coil on DC to charge the capacitor and then use a rotary gap to discharge the cap. Are you planning on building a large low frequency magnifier? ~Dan Kansas City area *60 or 50 Hz depending on your grid...I think the supply to the Colorado Springs Lab was 133Hz _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla
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