Copy letter from Herbert Rix, to Frank Watson Dyson, care of S R Wilson, Shibden Grange, Halifax The Society has been obliged to await Dyson's return to England in order to answer one or two queries for the figures for Dyson's paper. The engraver wishes to know if the ordinates and abscissas of the curves should be shown and whether the difference in thickness of the curves on some of the diagrams is accidental or should be expressed. 27 September 1892