Letter from Reginald Edward Stradling, Ministry of Home Security on a paper 'The production of waves by the sudden release of a spherical distribution of compressed air in the atmosphere' by J J Unwin to J D Griffith Daviees, Assistant Secretary of the Royal Society Can't see any objection to its publication. It is such a pure science contribution that it cannot give away serious information. [Published in Proceedings of the Royal Society A, 1941]. Endorsed on verso as received 8 August 1940. 7 August 1940