Re: New coil

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

Original poster: "Steve Cook" <steve-at-g8cyerichmond.freeserve.co.uk> 

I would add something to the waxed timber idea, higher melting point waxes
are best, most candle-making supply places can sell you a variety. Addinng
up to 10% stearin helps the impregnation process too, you can get stearin
from the same suppliers. (Guess who make candles as another hobby?)

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 08, 2004 8:20 AM
Subject: Re: New coil


 > Original poster: Ed Phillips <evp-at-pacbell-dot-net>
 >
 > "There's a long and illustrious history of using properly prepared wood
 > in HV
 > devices.  Heat it to dry it, immerse it in something to keep from
 > soaking up
 > the water (like melted paraffin (wax to those of you in the rest of the
 > anglophone world)), etc. (Hmm, a hydrocarbon/cellulose composite
 > material..
 > conceptually, not that far from fiberglass reinforced plastic, when you
 > think about it)
 >
 > Other popular insulating materials in "pre plastic" days: sulfur,
 > ebonite
 > (whatever that is...I'm sure one of the historical mavens on the list
 > will
 > tell us what it is)"
 >
 > The waxed wood is great stuff and I use it frequently.  One advantage
 > is that soft wood like pine, when waxed, can be machined with finer cuts
 > than in the natural state.  One word of caution though.  Melted paraffin
 > is dangerous stuff, both from the standpoint of fire and damage to the
 > human body.  One further note is that it's easy to get the stuff so hot
 > that it will char wood.  Best temperature seems to be a bit below that
 > point; leave the stuff in until it quits bubbling and then remove it and
 > cool it.  Bear in mind that most wood shrinks several percent as the
 > water is driven out, so if dimensions count do your treatment before
 > cutting things to size.
 >
 > Ed
 >
 >
 >