Referee's report by William George Penney, on a paper 'The supersonic flow of compressible fluid through axially symmetric tubes of uniform and varying section' by R K Tempest Sectional committee: Physics Recommended for publication in Proceedings. The author has overlooked the most fundamental property of supersonic potential flow. There are other exampled of divergent supersonic potential flows that merit discussion. [Published in Proceedings of the Royal Society A, 1950]. Date received not given. 29 August 1949