Diagrams, experimental equipment and observations by Edwin Henry Barton Two diagrams, labelled figures 1-2, showing a 'Diagrammatic outline of the apparatus used for producing and measuring the interference of electrical oscillations' and a 'Diagrammatic view of waves, drawn, for clearness' sake, as though they were rays incident and reflected obliquely' respectively. These are followed by two graphs, labelled curves 1-2, showing experimental results and illustrating the theory employed by Barton in the accompanying paper. Subject: Electricity / Mathematics Prints of these diagrams were published in volume 54 of the Proceedings of the Royal Society alongside the paper 'Electrical interference phenomena somewhat analogous to Newton's rings, but exhibited by waves passing along wires of which a part differs from the rest'. 1893