RE: Pri/Sec spacing

Subject:  RE: Pri/Sec spacing
  Date:   Sat, 7 Jun 97 06:33:43 UT
  From:   "William Noble" <William_B_Noble-at-msn-dot-com>
    To:   "Tesla List" <tesla-at-pupman-dot-com>

I don't think the plexiglass will do much good.  I have wound my pri
with 1/4 
inch tubing on 1/4 inch plexiglass, with the inner turn of the primary
through a hole and back to the outer edge, so there is the plexiglass
the feed line to the inner turn and the rest of the primary.  I noticed
last weekend that if I let the feed line get close to the plexiglass, I
get a significant corona between the outer turns and the feed line to
inner turn.  This suggests to me that the insulation afforded by the 
plexiglass won't do much to protect against a HV strike.

From:   Tesla List
Sent:   Friday, June 06, 1997 6:36 AM
To:     tesla-at-poodle.pupman-dot-com
Subject:        Pri/Sec spacing

I myself am still working on my first coil and was planning on
mounting a flat 1/4" tubing primary BELOW a 1/4" x 2' x 2' sheet
of plexiglass, and mounting the secondary above the sheet.  This
would seem to afford some good protection against primary strikes
and at the same time, make primary tap adjustment very
accessable.  As I am now preparing to start on my secondary
(4.25" x 20"), I'm wondering how close to the end to start my
winding, and whether I might not be able to get the secondary
close enough to the primary using this geometry.

Gary Lau
Waltham, MA