Diagrams, experimental equipment and results by Shelford Bidwell Five diagrams, labelled figures 1-2 and 4-6, the first showing the apparatus used for performing Bidwell's experiment into the changes produced by magnetisation in the length of rods of iron, steel, and nickel followed by four graphs relating to the results of the experiments on iron, hard steel and nickel. Subject: Magnetism Prints of these diagrams were published in volume 40 of the Proceedings of the Royal Society alongside the paper 'On the changes produced by magnetisation in the length of rods of iron, steel, and nickel'. 1885