Letter from J D Griffith Davies, Assistant Secretary of The Royal Society, 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 the Ministry of Supply It has been decided that the paper won't be published until after the war. It will be printed for confidential use instead. Asks if the Ministry of Supply would like a copy. [Published in Proceedings of the Royal Society A, 1946]. 10 October 1940