Re: "High Frequency Therapeutic Apparatus".
Here are a couple of shots of some of the hyperbole that was associated with short-wave therapeutic treatments in the 1930s.
Fascinating! Reminds me a lot of the promotional blurb associated with a bunch of currently-fashionable quack-medical 'therapies'.
As to the interference-generating ability of these sorts of things - yes there are often 'burblies' around 13.56 and 27.12MHz ISM frequencies when the bands are open: let's face it, if you're running a multi-Kilowatt self-excited power-oscillator with raw AC on the anodes and long floppy leads coupling it to a load of variable capacitance/RF-lossiness it's not going to be very frequency-stable, and the results could be heard worldwide!
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