Diagrams, experimental equipment and results by A [Arnulph] Mallock 15 diagrams, labelled figures 1-4 and diagrams 1-11, showing experimental apparatus used and results obtained during Mallock's investigation into the measurement of Young's modulus for crystals. The apparatus is described in detail in the accompanying paper. Includes notes to the engraver. Subject: Physics / Crystallography Prints of these diagrams were published in volume 49 of the Proceedings of the Royal Society alongside the paper 'Some measures of Young’s modulus for crystals, &c'. 1891