Some Factors Affecting Combustion in an Internal-Combustion Engine
This is a 1936 NASA technical report on combustion in internal-combustion engines, issued through the NASA Technical Reports Server and presented as engineering research for fellow engine specialists. Its pictures are plain engineering graphs: smooth pressure-against-crankshaft-angle curves plotted on gridded paper, each labelled with numbered traces, alongside dark high-speed photographs of flame fronts and combustion streaks. A designer could take the restrained grid-and-curve layout and the sharp contrast between black flame photographs and pale graph paper as a clean model for technical data displays.
