Tuning Isis and Osiris

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Parpp807-at-aol-dot-com>

Hi Nick,
I finally got the primary coils tuned in. 
I connected the two primary coils in series with a 500 Ohm resistor and the 
signal generator. I put my good Tek 2246 across the resistor. The coils are 
spaced around 9 feet from eachother.
Tuning is from the bottom up with Cp. I'll send you an attachment if you 
wanna 
see the circuit. I spent several daze trying to dip the circuit with a RMS 
digital mA
meter in place of the resistor and scope. I finally read the fine print for 
the meter to discover that 
the darn meter poops out at 100 kc. This was causing all sorts of spastic 
parasites
and artifacts in the measurements. I also had the sig gen in parallel until I 
began
to suspect that I might be loading down the generator excessively. Learning 
slowly.
I tuned the coils by clipping the leads from Cp onto the coil, using the same 
spot on each coil. I then adjusted the sig gen to find the arbitrary F res. 
If too high, 
I added Lp, and if too low, I removed turns. I kept twiddling until I zeroed 
in on 
the exact spot where F res for the primaries is 151 kc = F res for the each 
secondary with its topload.
Can you find anything in all this where I am still screwing up something?

You were certainly correct when you said that tuning a twin coil is the most 
gul durn
cantankerous thing ever. I thot it would be simple. Now I gotta put the beast 
back together and fire it up for the 100 inch sparks.

Q:
What's happening here? F res for EACH secondary is 151 kc. I have tuned the 
two primaries in series and across Cp. That's how they are connected in the 
twin. But 
I have tuned the two primary coils in series so the TWO of them resonate at 
151 kc. Then we
are going to wrap each primary around its secondary with the two primaries in 
series
and across Cp. Is each primary resonating at 75.5 kc? The primaries are far 
apart and the bases of the secondaries are tied
together and grounded to the power line ground. And to make things even 
funnier,
We will have to find the electrical zero point by trial and error. All very 
funny, I wish I understood the joke.     

Happy day,
Ralph Zekelman