The Measurement of the Damping in Roll on a Jn4h in Flight
This 1924 NASA technical report on measuring roll damping in a JN-4H aircraft in flight was issued by the NASA Technical Reports Server for aeronautical engineers. Its pictures are plain line graphs of roll rate and damping coefficient against air speed in miles per hour, with a photograph of the biplane on an airfield; a designer could borrow the clean graph style, the thin curves and labelled axes for technical infographics.
