Galvanic tractors with leather case; designed in Connecticut by Elisha Perkins and patented in 1798.
Perkins metallic or magnetic tractors were a therapeutic fad of the times; they were compass-like contrivances with one blunt, rounded end and one sharp, pointed end, usually made of combinations of copper, zinc and gold or iron, silver and platinum. Cures were obtained, allegedly, by stroking and were, particularly, in vogue in England.