magnetic core

• To: tesla-at-pupman-dot-com
• Subject: magnetic core
• From: Joe Cummings <joecmn-at-globalnet.co.uk>
• Date: Fri, 31 Jan 1997 14:49:21 GMT
• Subscriber: joecmn-at-globalnet.co.uk Fri Jan 31 23:08:06 1997

>To: tesla-at-pupman-dot-com
>From: Joe Cummings <joecmn-at-globalnet.co.uk>
>Subject: magnetic core
>
>Some years ago I built a tesla coil from a motor car spark coil and what
scraps I could muster. I was disappointed at the results, but didn't have a
great deal of money at the time. However, when you're skint(broke) you think!
>
>I reasoned that if the coil was operating at radio freqency, then a ferrite
rod such as is found in portable radios might enhance the effect.  The only
ones that were available were about 10-15cms. in length and about 7.5mm in
diameter.  When I inserted the ferrite rod into the core I was gratified to
see an intensification of the effect.
>
>Has anyone tried this?  I thought it might be possible to use ferrite
powder in a glass tube for a bigger coil, but I now believe that the
magnetic properties are imparted to the ceramic in the heating process.
>
>For a discussion of ferrites and further references, see Kirk-Othmer,
Encyclopedia of Chemical Technology, publishers Wiley Interscience.
>
>Best wishes,
>
>Joe Cummings
>

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