Most extraordinary discovery : Pulvermacher's patent portable hydro-electric voltaic chain / Charles Meinig.

Leaflet advertising a "small apparatus similar to a necklace [whic] evolves, when applied to, or worn on the body, a mild but continuous and perceptible electric current ... productive of the most astonishing effects on the human frame. Acute nervous pains, such as head-ache, tooth-ache, tic-doloureux, rheumatic pains, &c."