Referee's report by Edward Neville da Costa Andrade, 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 Diffraction by an infinite wedge' by Frederick Gerard Friedlander Sectional committee: Physics Not recommended for publication at the present time. The proof that Sommerfield and Lamb solutions are equivalent would 'stimulate interest in the problem in undesirable quarters'. [Both papers published in Proceedings of the Royal Society A, 1946]. Endorsed on verso as received 6 April 1940. April 1940