Letter from J D Griffith Davies, Assistant Secretary of the Royal Society, on two papers 'The diffraction of sound pulses I. Diffraction by a semi-infinite plane' and 'The diffraction of sound pulses II. Diffraction by an infinite wedge' by Frederick Gerard Friedlander to Edward Neville da Costa Andrade Asks for his opinion on the paper, as Egerton has doubts whether it should be published at this time due to developments in regard to sound recording and silencing. [Both papers published in Proceedings of the Royal Society A, 1946]. 5 March 1940