Engine Knock and Combustion Chamber Form
This is a 1939 NASA technical report on engine knock and combustion chamber design, written for aeronautical and automotive engine researchers and published as part of the NASA Technical Reports Server collection. Its pictures are plain black line diagrams of engine cylinder heads, valve and spark plug layouts, and flame-front propagation charts, drawn with precise hatching and dimension lines. A designer could borrow their clean technical-drawing conventions, sectional hatching, and schematic labelling for diagrammatic graphics.
