The Violet Ray Machine emerged in the early 1900s during the rise of high-frequency electrotherapy. Nikola Tesla did not invent the device, but his pioneering work with high-voltage, high-frequency coils directly inspired the technology behind it. The actual developers were early electrotherapy manufacturers and inventors such as: ~ Frederick Finch Strong (a leading figure in high-frequency medical devices) ~ Thomas Burton and other early 20th-century electrotherapy engineers ~ Companies like Re