Technical Section of Aeronautics
This is a 1923 technical section of aeronautics from the NASA Technical Reports Server, a government engineering publication for aviation specialists and researchers. Its two pictures are scientific charts: one plots airspeed and climb curves against altitude up to a 6500 m theoretical ceiling, the other a labelled pressure-temperature reduction diagram with Greek-lettered points and dashed construction lines. A designer might take their clean, sparse line plots, dashed guide lines and hand-lettered axis labels as a model for technical diagrams.
