Diathermy has been used since 1930s to treat arthritis and to accelerate
bone repair issues. Regular MD's had these high frequency devices for
in-office theraputics. They are still used today at most sports facilities.
This article gives an overview of an early one:
https://www.sciencedirect.com/science/article/pii/S003452881830208X#bbb0010
A friend of mine has one. It is a high frequency oscillator with a glass
probe. The glass has an extended narrow neck with a bulbous end. When
energized, it gives off the appearance of a dancing brush discharge similar
to a Tesla Globe found at the Spencer Gift store.
Dick
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