Brass electric egg, C 1900
An electric egg on a brass base. The electric egg lies at the intersection of two technologies: high vacuum and high voltage. By the eighteen sixties vacuum pumps, and induction coils and electrostatic machines (including Wimshurst and Voss machines) had developed to the point where it was possible to create an electrical discharge in the residual gas between two small spheres in the evacuated space. Diameter 12 cm and 50 cm high.