Diesel-engine investigations : ignition-chamber engines
A 1930 NASA technical report on diesel engine research, specifically ignition-chamber engines, presented as engineering graphs for technical readers. Its pictures are dense line charts of crank angle, pressure and combustion variables plotted against fine gridlines, with labelled curves and hatched areas. A designer might take from them the spare, scientific chart style of early engineering reports and the use of labelled curves on a plain grid.
