Adaptation of aeronautical engines to high altitude flying
A 1923 technical report on adapting aircraft engines to high-altitude flight, issued through the NASA Technical Reports Server from a mid-century archive and written for engineers and aeronautical designers. Its pictures are plain black-and-white line diagrams of carburettors, a dynamic barometer, a pressure-regulating valve, and altitude-versus-oxygen graphs, drawn with labelled parts and clean hatching that a designer could borrow for technical or retro schematic motifs.
