Copy letter from Herbert Rix, to A Keen, 4 Raymond Buildings, Gray's Inn, W.C. 'Dear Mr Keen, Herewith I return the old plan and the new plan of diagram screens. I have now received authority to put the latter in hand, and, if this receives your immediate attention, it may perhaps be ready for our first meeting, which is exceedingly desirable. Yours truly, H Rix Asst. Sec. R.S. [Assistant Secretary, Royal Society]'. 7 October 1893