Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Professor [Arthur] Schuster, Secretary of the Royal Society and FRS 'Dear Dr. Schuster, The enclosed has just come marked "urgent", and you will like to reply at once if you can keep the appointment, as the question raised is of a kind which often comes up in our exemption applications. I suppose you will make it a Reserved Occupations Committee matter.' 10 December 1917