The airspeed "Oxford" training airplane (British) : a two-engine cantilever monoplane
This is a 1937 NACA aircraft circular, issued by the United States National Advisory Committee for Aeronautics, describing the British Airspeed Oxford twin-engined cantilever monoplane trainer. The pictures are technical line drawings and cutaway plans of the aircraft, with a plan view showing span, length, height and wing area, and a side elevation labelled with a general arrangement figure. A designer could draw on their precise, labelled diagram style for vintage technical infographics.
