“Davis & Kidders Improved Magneto-electric Machine for Nervous Diseases,” Second half 29th century.  A particularly fine example with brass-bound polished mahogany case with inlaid brass key escutcheon, containing a complete electro-medical apparatus with large permanent magnet, red velvet covered rotating coils, brass gearing, hand crank with a lovely turned ivory handle, and original handgrips and cords.  A working key is present and all is in VFC and working order.