Before the turn of the 20th century, Nikola Tesla was interested in the medical applications of high-frequency electricity and patented several objects for such an application.
One object was the violet ray generator that used various electrodes to send high-frequency electricity into the user’s body.
The device was used to treat many ailments from acne and dandruff to constipation and tuberculosis.
During the 1940s and 1950s, violet ray generators were found to be not only ineffective, but dangerous.
As a result, there were many lawsuits, and manufacturing of these devices was prohibited in the United States.
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