High frequency (violet ray) apparatus as used by Chisholm Williams, with five electrode accessories, c.1880-1928

Powered by mains electricity supply, this set was used to apply high frequency electrical sparks to the body using the glass vacuum electrodes. Known as violet ray treatment, the purple, red, or blue electric sparks were believed to relieve aches and pains in the muscles, internal organs, and the nerves (rheumatism) by massaging the surface of the skin with the electrode.

This kit was owned by Chisholm Williams (1866-1928) was an early adopter of X-ray and electrotherapy. Within weeks of hearing about the discovery of X-rays in 1896, he managed to take an X-ray of his fingers. he was in charge of the X-ray department of West London Hospital and lectured in radiology. He served in the Royal Army Medical Corps as captain and electrotherapeutist. Due to the prolonged exposure to X-rays, when their dangers were unknown, led to Williams’ hand being damaged and two fingers on his other hand amputated.