Wire Insulation Thickness

From:  Edward V. Phillips [SMTP:ed-at-alumni.caltech.edu]
Sent:  Wednesday, May 27, 1998 2:27 PM
To:  tesla-at-pupman-dot-com
Subject:  Re:  Wire Insulation Thickness

"> I was thinking it might be a good idea to wind a plastic fishing line
> between the wires on a large coil to increase the insulation rating.  The
> extra spacing should help arcing between turns.

	I (and probably many others here) have done that and think
it was a waste of time.  Used monofilament line to space the turns
about half a wire diameter.  Actually, it wasn't as much work as 
I thought it would be.  Have a simple hand winder (shaft with a
crank and a couple of conical pieces of wood to fit the end of the
coil form), and put on about 1000 T of number 28 in an hour or.
Fed the wire over the end of the spool and put the monofilament
spool on a dowel for an axle, and fed the stuff between mu
my fingers.  Advantage of the hand winder is that you can stop
and back up instantly if you goof.  Anyhow, except for a noticeably
higher resonant frequency, no difference in performance from a
close-wound coil.