Theoretical and Experimental Study of Ignition Lag and Engine Knock
A 1939 NASA technical report on ignition lag and engine knock in combustion engines, issued through the NASA Technical Reports Server for engineers and researchers. Its pictures are plain graphs of temperature, pressure and droplet data drawn as thin black curves on gridded axes, with labelled crank angles and B.T.C./A.T.C. markers, offering a designer a stark scientific chart vocabulary of rising curves, grids and dual-panel layouts.
