Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx> Hi Adam,That's the basic Seibt coil pic that's probably the best known. This is the maggy driver configuration (which is sitting up vertically next to the Seibt). Note the sparkgap is enclosed (between the 2 large jar caps and the induction coil). The spark gap light will ruin a view of the corona. Had no problems with it however. Just a matter of adjusting the corona wires far enough away so that sparks would not arc over to them and close enough to draw the corona. Takes a bit of fiddling around with them, but it's a pretty easy adjustment.
Most of the headache was designing the driver. The external C placed on the driver by the primary, the small L required, and the proximity of the primary to the driver coil all had to be nudged into what would be a working coil. I started to build a vertical driver as in the picture, but while doing some models with the driver coil positioning, I realized that moving the driver coil up or down in relation to the primary would give a decent range of tuning (without messing with the primary tap). From that realization, I simply built it horizontal to accommodate ease of tuning. Coupling does not change a great deal in this particular driver when moving the coil. The reason is that the movement is small in comparison to the primary coverage.
Take care, Bart Tesla list wrote:
Original poster: mercurus2000 <mercurus2000@xxxxxxx>Here's something you might find useful, this is a drawing of a old setup for visualizing standing waves on a resonator by corona, I've attempted this, you will need to have a very good thick insulator for the final coil and make sure you're operating it at a VERY high frequency and voltage or you'll just have it arc to one spot and burn the insulation up.http://hot-streamer.com/temp/mk95939.jpg Adam Tesla list wrote:Original poster: acmq@xxxxxxxxxxxxxxxx > Original poster: Ed Phillips <evp@xxxxxxxxxxx> >>There is something in this old Max Kohl catalog:>>http://vlp.mpiwg-berlin.mpg.de/library/data/lit21186/index_html?p n =343&ws=3&wid=digi_1024> That's a most interesting link and leads to lots of others. I > couldn't find a date for this particular catalog - do you know what > it is? I found some of the later pages dealing with "Hertzian > apparatus" and experiments to be of equal interest. I didn't find a publication date too, but in the introduction there are many comments from customers with dates in 1926. Look here, for more catalogs:http://www.sil.si.edu/digitalcollections/trade-literature/scientific-instruments/Antonio Carlos M. de Queiroz