Abstract PREFACE TO THE FIRST EDITION. A short course of lectures on Aero Engines was given by the author at the Northampton Polytechnic Institute during 1914. On the suggestion of Mr Charles E. Larard, M.Inst.C.E., M,I.M.E., Head of the Engineering Department, the matter contained in these lectures - necessarily somewhat rearranged and largely extended-is now issued in book form, in the hope that it may be found of assistance to a wider circle of readers.The engines are classified as...