Diagrams, experimental equipment by Lord Rayleigh [John William Strutt] Two diagrams in pencil and ink, labelled figures 1-2, showing systems of tubes and vessels used in Strutt's experiments on the densities of hydrogen and oxygen. Subject: Chemistry Prints of these diagrams were published in volume 50 of the Proceedings of the Royal Society as 'On the relative densities of hydrogen and oxygen. II'. 1892