"Violet Ray" Machines were portable handheld Tesla Coils that applied sparks to the skin diffused through glass electrodes.  These electrodes were made to conform to every conceivable body part to "cure" virtually every known disease... originally they were sold for legitimate reasons, mainly treating minor skin conditions (such as acne), but as they grew popularity so grew the extravagant claims...which eventually led to the FDA seizing countless devices and companies being put on trial.  
Today the machines are still sold for their original intent to aestheticians and beauticians and remain one of the most popular medical collectibles.  They are also gaining popularity worldwide in the fetish markets as unusual and provocative "sex toys".  These device prove that history is stranger is fiction...

Click here for the Violet Ray Photo Gallery