Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. Charles Chree, FRS Notifies him that Professor [Arthur] Schuster has proposed the calling of a Magnetic Sub-Committee meeting. Asks Dr. Charles Chree whom he considers the key members of this Committee to be. He lists Professor J. [John] H. [Henry] Poynting, Sir Arthur [William] Rucker, Professor Schuster, Mr G. [George] W. [Walker] Walker, Sir [William] Napier Shaw and Professor W. [William] Watson and asks for Dr. Chree's verification. 1 November 1915