This high-frequency radiation device was used for violet ray electrotherapy, which was said to cure everything from lower back pain to catarrhs and brain fog. This device also claims to help with asthma, sciatica, rheumatism and warts.
It uses Nikola Tesla's eponymous coil to produce a high-frequency, low-current beam which is then applied to the skin. It was first patented in the late 19th century by Tesla himself. Felma G.M.B.H made this machine specifically, and included are a leaflet and an instruction book printed in German.
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Donated by Sylvia Meyers.