Richardson's Magneto-Galvanic Battery

Richardson's Magneto-Galvanic Battery is an electrotherapeutic medical medallion, similar to Boyd's Battery, with fifteen metal discs (as compared to Boyd's twelve) surrounding the central metal piece, which has the shape of a heart or, in later versions, a cross. It was sold by A.M. Richardson, for whom it is named, and sold beginning around 1881.