Copy letter from Robert William Frederick Harrison, to J H Grindley, Applied Mechanics Department, University of Liverpool 'Dear Sir, I have to acknowledge your letter of the 24th instant, with reference to your paper on "The Flow of Air through a Pipe", and to say that your request for the return of the paper for revision will be brought before the Physics and Chemistry Sectional Committee at their meeting on July 2nd. I am, faithfully yours, Robt [Robert] Harrison Asst. [Assistant] Secretary R.S. [Royal Society]'. 27 June 1907