Samuel M. Goldwasser wrote:

writes:

I think there is a piece missing from the device, it was like that when
I bought it.Looking at the inside of the tip of the device, there is a
round metal tube which has a bottom, a little philips head screw holds
the metal tube in place.
cuhulin

Possibly an Oudin or Tesla coil for checking vacuum systems and other
equipment with high voltage like:

http://www.electrotechnicproduct.com/

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That's it! My father had arthritis and bought one that included several
glass discharge tubes that plugged into the HV socket. Turn the knob to
adjust the buzzer that controlled the excitation, put the tube against
where it hurts (or Hertz) and the tube lit up with a pale blue discharge.

The UV generated a little ozone. The discharge current leaked through the
glass and produced a tingling on your skin. Neither effect cured
arthritis.

That was 50 years ago. Now I've got arthritis.