Determination of ignition points of liquid fuels under pressure
A 1925 technical report on determining the ignition points of liquid fuels under pressure, issued through NASA's Technical Reports Server and aimed at engineers and fuel researchers. Its pictures are plain graphs and three-dimensional surface charts plotting ignition temperature in degrees Celsius against absolute atmospheres and fuel mixture percentages, with labelled curves for oils such as coal-tar, shale, lignite-tar and lubricating oil. A designer might take from them the clean grid-and-curve vocabulary of early engineering data graphics, with dashed guide lines, stepped axes and lettered series.
