Fuel Vapor Pressures and the Relation of Vapor Pressure to the Preparation of Fuel for Combustion in Fuel Injection Engines
This is a 1930 NASA technical report on fuel vapor pressures, written for engine researchers studying fuel injection, and its pictures are plain graphs of vapor pressure in pounds per square inch plotted against temperature in degrees Fahrenheit. Each chart uses thin black curves with dashed or symbol-marked data series, a gridded background, and labeled legends, offering a designer a sober model for technical charts with clear axis labels, small key boxes, and restrained line weights.
