Meteorological conditions during the formation of ice on aircraft
A 1932 NACA technical note from the NASA Technical Reports Server, written for aeronautical researchers studying how clear ice and rime form on aircraft in flight. Its pictures are plain statistical line charts plotting percentage frequency and case counts against altitude in feet and air temperature in degrees Celsius and Fahrenheit, with solid and dashed curves labelled clear ice and rime. A designer might take the restrained grid-and-curve vocabulary, the two-line legend contrast, and the dual-scale axis labels as a model for data graphics.
