Electric discharges to the surface and edge of a coin obtained with a Ruhmkorff coil or Wimshurst machine by Etienne Leopold Trouvelot, ca. 1888 - Postcard
Electric discharges to the surface and edge of a coin obtained with a Ruhmkorff coil or Wimshurst machine by Etienne Leopold Trouvelot, ca. 1888 - Postcard