Samson Low, n.d., (WWII) ; Xi + 180 pp., numerous ills. Blue cloth ; 19 x 12cm. V.G. This Second World War book was originally designed to help ground-crews and others whose job it was to shoot at or plot enemy aircraft, recognise the planes in question. It points out in the introduction that the book is of equal importance to fighter pilots and air gunners. Chapters cover : First Principles ; The Theory of Flight ; Design and Construction of Aeroplanes ; The Nose ; Engines ; Wings ; Fuselage ; Tail-Unit ; Oddments ; Examples ; Optical Illusions ; Sit ; Biplanes ; What to Study ; Conclusions ; Silhouettes.