Diagrams and photograph, experimental equipment and results by Shelford Bidwell A photograph, labelled figure 1, showing the rings of anneated iron used in Bidwells experiments into the effect of magnetisation upon the dimensions of wires and rings of annealed iron. This is followed by two graphs, labelled figures 2-3, showing experimental results. Subject: Metallurgy / Magnetism Prints of the graphs were published in volume 55 of the Proceedings of the Royal Society alongside the paper 'On the effect of magnetisation upon the dimensions of wires and rings of annealed iron'. 1894