Re: Diathermy Techniques: Zapping tissues with Tesla Coils
Jeff Behary wrote:
>The design of the Diathermy Machines was incredible. The spark gaps,
>resonator coils, and general arrangements were extremely novel. Some used
>flat spiral primaries AND secondaries, others used unique winding
>techniques, and the spark gaps were different for each manufacturer, all
>novel in their own respects. Some didn't work worth a darn, and others
>were SUPERB! [Fischer is a FINE example!]
Yes. My previous employer used to make these devices back in the dark ages.
Made their own HV xfmrs and MICA/COPPER plate caps (no oil - but
vacuum/varnish treated). Would die for some of those scraps!
One of the coolest things was a self-adjusting spark gap bank, composed of
up to 21 tungsten contacts, each about 3/8 diameter. The mechanism would
automatically set each gap to 0.006 inch each time the power was cycled.
Those old engineers were very clever.
Oh - back to tungsten - I made a watercooled spark gap out of tungsten
carbinde machine tool cutting inserts and had no unusual difficuly with the
higher resistance of the carbide. As has been pointed out - the arc itself
is what dissipates most of the power.
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