Nonetheless, the violet ray machines were very popular and were used even as late as the 1950's. There decline was due to a high demand for radio transmitters in world war 2 and the electronics factories producing them stopped doing so. They were also stopped in the 1940s by numerous law suits from the FDA despite many respected doctors and physicians writing books on and supporting the devices. The FDA (Federal Drug Administration) did not support electrotherapy which was competitive to their industry.

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In 1893 Nikola Tesla presented at the Colombian Exhibition in Chicago his invention the alternating current generator which we still use today to send electricity over long distances. At the same exhibition, he presented another of his inventions, the Violet Ray Machine. The Violet Ray Machine used a Tesla coil which generated a certain form of energy which in turn stimulated or facilitated the movement of energy through the body. While many of us consider ourselves as a complex chemical organism, electromagnetism is perhaps more important although less acknowledged aspect of the human body.

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