Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to F. G. Selby Esquire; Secretary of the Advisory Committee for Aeronautics 'Replying to your letter of November 15th, it will be convenient for you to have the use of a room at the Royal Society for the following meetings of the Advisory Committee for Aeronautics: Aerodynamics Sub-Committee, December 3rd, 2.30pm Engine Sub-Committee, December 10th, 11am Advisory Committee, December 10th, 3pm.' 18 November 1918