[Boatanchors] 812 Self-Rectifying Power Oscillator

[Jim Wilhite]

It, probably, was just as effective as some of today's treatments for 
which they charge thousands of dollars.

Jim/W5JO


----- Original Message ----- 

> Diathermy was wherever the patient wanted it to be,  until the evil 
> FCC
> banned it to an ISM frequency at 27 MHz (in the 1930's, I believe). My
> grandfather's diathermy set had a big knob labeled "Patient Control" 
> which
> controlled the big air-variable capacitor for the push-pull oscillator 
> tank
> coil. Changing the frequency apparently changed the effective 
> penetration
> depth, affecting the patient's sensation of warmth.  Sadly, I was too 
> young
> to have seen this set in operation before it was banned.
> 73,
> Chuck
>