Diagrams, experimental equipment by Joseph Wilson Swan Six diagrams, labelled figures 1-6, showing the experimental setup used by Swan in his investigations into voltaic combinations with a fused electrolyte and a gaseous depolariser. Subject: Electricity Prints of these diagrams were published in volume 56 of the Proceedings of the Royal Society alongside the paper 'On some voltaic combinations with a fused electrolyte and a gaseous depolariser'. 1894