Violet ray

Not to be confused with Purple Ray.
Antique violet ray set with glass electrode (left) and control box. When energized, the glass emitted a violet glow (inset, center)
Another electrode used with the same set.

A violet ray is an antique medical appliance used during the early 20th century to discharge in electrotherapy. Their construction usually featured a disruptive discharge coil with an interrupter to apply a high voltage, high frequency, low current to the human body for therapeutic purposes.[1]

  1. ^ Improvements to Violet-Ray Generator of the applicator type, designed primarily for therapeutic use 1506344, Janke, Benno, "Violet-Ray Generator", published January 30, 1923, issued August 26, 1924 .