Pitman, 1st ed., 1940. Vii + 112 +8 pp., over 50 photo-ills., + ills., including a fldg., diagram. Blue cloth ; 19 x 12cm. Spine faded, small owner’s details to f.f.e.p., o/w V.G.+. In writing this book the author intended to fill a gap in aeronautical instruction books. It attempts to combine in a convenient-size volume a short explanation of the theory of the four-stroke cycle as applied to aero engines, together with an explanation of the more important points concerning engine components, carburettors, magnetos and sparking plugs, superchargers etc. The authoritative text is supported by over fifty photographs and diagrams, including a folding drawing.