Viscosity of diesel engine fuel oil under pressure
A 1929 technical report from the NASA Technical Reports Server, a government aeronautics-era study of how the viscosity of diesel engine fuel oil changes under pressure at several temperatures. It was written for engineers and researchers testing fuel behaviour in engines. Its three pictures are scientific charts, with plotted data points and nearly straight or curved lines, labelled in poises, thousands of pounds per square inch, and degrees, offering a designer only a restrained grid-and-line vocabulary for technical diagrams.
