Some Notes on Gasoline-Engine Development
A 1927 technical report on gasoline-engine development, issued by the National Advisory Committee for Aeronautics and held in the NASA Technical Reports Server collection. Its one picture is a line graph of pressure in pounds per square inch plotted against crank angle, with three labelled curves marked A, B and C and a fine grid. A designer might take from it the clean, measured look of early engineering charts, with plain grid lines, sparse lettering and a restrained two-tone scheme.
