Perhaps involved in electrotherapy. This was used for example in treating " shell shock" after WW1particularly by Dr Yealand at the National Hospital for Neurology and Neurosurgery in Queen Square, London.
From
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3673538/"Electrical treatment had its heyday in the 19th century, fuelled by advances in both electromagnetism and neurophysiology (Rowbottom and Susskind, 1984). Departments of electrotherapy were opened in leading teaching hospitals, such as the Radcliffe Infirmary in Oxford and Guy’s Hospital in London where Golding Bird applied faradic currents for the treatment of hysterical paralysis in the 1840s. The main advocate of electrotherapy in France was Guillaume-Benjamin-Amand Duchenne (1806–75), who applied it for the treatment of disorders of peripheral nerve and muscle. His 1855 work, De l’électrisation localisée, was translated into English in 1871 by Herbert Tibbits (1838–91), the medical superintendent of the West End Hospital for Diseases of the Nervous System in Welbeck Street, London. Electrotherapy was also popular with asylum psychiatrists in the late 19th century, applied not only to the limbs but also to the head, and there were occasional reports of inadvertent seizures, in effect precursors of electroconvulsive treatment. "
There was also electric light therapy
https://museumandarchives.redcross.org.uk/objects/6426ISTM possibly a member of the Incorporated Society of Trained Masseuses
https://cdm16198.contentdm.oclc.org/digital/collection/p16198coll1/id/155/