Many patients required home visits, and these apparatus became very useful for the physician. Several companies such as AS Aloe, HG Fischer, Campbell, and Frank. S Betz decided to make similar lightweight apparatus that could offer more than just one function. With more and more portable apparatus showing up on the market, several companies decided to market these devices to the public for home use. Use daily for 4-6 minutes with a medium current.
Results are apt to be slow, therefore be patient.
While many conditions in hospitals were treated with various high frequency currents, often required much more electricity than the Violet Rays offered. Much research went into the production of these devices, and each device gives a specific type of electricity for treating specific diseases. It has usually been applied when a vacuum electrode is used, without regard to whether the current was a high-frequency or simply a high voltage one, either being sufficient to cause the violet color to appear in the electrode. Eventually, several cases appeared in front of U.S. Courts over the years concerning the claims given to the Violet Ray machines. Nikola Tesla designed many coils, and was quite the showman.