Hydroelectric Baths for Migraines

1 of 9 Terrifying Medical Treatments from 1900 and Their Safer Modern Versions.
http://mentalfloss.com/article/57983/9-terrifying-medical-treatments-1900-and-their-safer-modern-versions

9. Hydroelectric Baths for Migraines

Taking the toaster into the bathtub may be fatal today, but for several decades starting in the late 19th century, some doctors recommended treating chronic migraines by lounging in a hydroelectric bath – a warm tub with a small current passing through the water. Doctors eventually became skeptical of this method, and today’s migraine sufferers can turn to more effective pharmaceutical treatments.