Referee's report by William Jolly Duncan, on a paper 'The measurement of skin friction in a turbulent boundary layer at a Mach number of 2.5, including the effect of a shock wave' by W F Cope Sectional committee: Engineering Paper reference code: A76 Recommended for publication in the Proceedings, though the referee notes there is 'some careless writing' in the paper which needs amending. [Published in Proceedings A, 1952]. Date received not given. 9 June 1952