Referee's report by Alfred Charles Glyn Egerton, on a paper 'A study of the reactions that lead to 'knock' in the spark ignition engine' by Diarmuid Downs, Arthur Donald Walsh and R W Wheeler Sectional committee: Engineering Paper reference code: A223 Recommended for publication in the Philosophical Transactions with Egerton's remarks on the good presentation of the paper and results. [Published in Philosophical Transactions A, 1951]. Date received not given. 6 December 1950