How to rise the secondary?

From:  Malcolm Watts [SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent:  Monday, June 29, 1998 1:37 AM
To:  Tesla List
Subject:  Re: How to rise the secondary?

John, all,
              I have an idea on this based on observation:

> From:  John H. Couture [SMTP:couturejh-at-worldnet.att-dot-net]
> Sent:  Sunday, June 28, 1998 12:23 PM
> To:  Tesla List
> Subject:  Re: How to rise the secondary?
>   Ed, All -
>   What are the advantages of raising the secondary? This will change the
> coupling and tuning but that can be done by proper design of the primary. Or
> have you found other reasons for raising the secondary?
>   I would expect that moving the secondary away from the primary would
> reduce the spark output.
>   John Couture

For a relatively high frequency coil, losse coupling works well. I 
suggest this is because it prolongs the time energy resides in the 
secondary on the first (and successive) beats. In effect, it 
increases beat time, something that could be a disadvantage at lower 
frequencies as low frequency coils are generally those possessing a 
fairly high Ctot in the secondary system and because they generally 
run at much higher levels of Ep, also experience fairly high gap 
losses. In a low frequency coil, even comparatively tight coupling
means a long beat time because of the low resonant frequency.
     The point to all this is that the longer energy hangs around in 
the secondary at the highest amplitude, the better sparks can form.