Copy letter from Robert William Frederick Harrison, to Dr J A Fleming, Fellow of the Royal Society, Electrical Engineering Laboratory, University College, Gower Street, W.C. 'Dear Sir, I am obliged by your note received this morning relating to your and Prof. [Professor] Dewar's paper. I have not yet the diagrams mentioned in your letter to Lord Rayleigh, but have now sent on the paper to be set up to avoid delay. It would be well, however, if you could send me the diagrams as soon as possible, I am, yours faithfully, Robt Harrison Asst. Sec R.S. [Assistant Secretary, Royal Society]'. 5 May 1896