Diagrams, experimental equipment and results by James H Gray and James B Henderson A drawing of an apparatus consisting of springs and pulleys for observing the effects of mechanical stress on the electrical resistance of metals, with a corresponding print, followed by two graphs of experimental results. Annotations in pencil and ink. Includes four diagrams of experimental apparatus and results. Subject: Physics / Metallurgy / Electricity Prints of these diagrams were published in volume 54 of the Proceedings of the Royal Society alongside the paper 'The effects of mechanical stress on the electrical resistance of metals'. 1893