Re: bipolar coil (wrong title before)

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

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

Will,
I am presently working on a 48 inch bipolar.
There are two-forms to a bipolar that I know of.
The classical coil is a continuous-wound secondary mounted horizontally with 
the 
primary mounted over the center of the coil with an equal number of turns 
each side of center. The center of the secondary is the zero point where the 
1/2 wave current is at a maximum. The voltage rises to a maximum at the ends 
of the coil where the "rabbit ear"
rods extend. The spark travels between the rods. I use 3/16 copper tubing for 
the 
primary.

Connect the spark gap between the HV leads of the NST so the SG is connected 
in parallel, just the way you said. From either side of the SG / NST 
connection, connect to one side of the capacitor. The other side of the cap 
goes to one side of the primary. The other side of the primary goes to the 
other side of the SG / NST connection. Wind at least ten turns on the primary 
but the tuning is done from the center of the primary outward. So not all the 
turns are used. the center is zero. Count right and left from there.

                                             .   ..........5 4 3 2 1 0 1 2 3 
4 5.........

If this is not the bipolar form you are referring to, you may mean the form 
with two vertical
secondary coils spaced several feet apart. The connections are the same but 
the primary is physically split into two halves with the centers connected by 
a length of HV lead.

Hope this helps.

Happy day,
Ralph Zekelman