Letters from the Ministry of Home Security, on a paper 'Explosion waves and shock waves. VI. The disturbance produced by bursting diaphragms with compressed air' by William Payman and Wilfred Charles Furness Shepherd to J D Griffith Davies, Assistant Secretary of The Royal Society The Committee is anxious to discuss the paper and requests seventy five copies. [Published in Proceedings of the Royal Society A, 1946]. Endorsed on recto as received 24 September 1941. 23 September 1941