The death mask of Nikola Tesla in the offices of Gernsback Publications, New York City, in celebration of the Tesla centennial, June 25, 1956. The mask was heavily electroplated with copper, a process that took ten days, and was mounted on a marble-composition pedestal. Three medallions, executed in bas-relief on the base, commemorate Tesla's greatest inventions: the Tesla oscillation transformer, the first AC induction motor, and the tower for wireless power transmission.