Unpublished diagrams, 'Diagram of the analysis of the perturbations from the simple logarithmic law' by George Johnstone Stoney Five diagrams, labelled figures 1-5, showing a series of charts. The ordinates of figure 1 'are the horizontal displacement of the observed positions from the curve of plate 1 [see AP/65/9/2], each displacement being magnified four times.' Subject: Chemistry / Mathematics 1888