Referee's report by Ernest Frederick Relf, on a paper 'The conical shock wave formed by a cone moving at a high speed' by J W Maccoll Sectional Committee: Engineering Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests reproducing at least one or two of the photographs to indicate the accuracy at which wave angles can be obtained experimentally. Hopes the Committee with inform the author of the new rules regarding references and cited works in the text. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 19 January 1937. [January 1937]