The device consists of two hemispheric brass shells (diameter 12.5 cm), with a rounded edge, each with a glass insulating handle. On bringing the two hemispheres together, a small (diameter 2 cm), round opening remains; through this passes the insulating support of a conducting sphere which is placed in contact from the inside with the two hemispheres. On separating the two hemispheres, by means of an electroscope we can verify that the conducting sphere is completely discharged while the two hemispheres are charged. It is thus demonstrated that in a conductor in electrostatic equilibrium the charge is distributed on the surface.

Murani (1906), Vol. II, p. 264
Privat Deschanel (1869), p. 540

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