Some Characteristics of Fuel Sprays from Open Nozzles
This is a 1930 NACA technical report issued by the National Advisory Committee for Aeronautics, a US government aeronautics research body, and was written for engineers studying diesel engine fuel injection. The pictures are plain black-and-white engineering drawings and charts: penetration-versus-time curves, a cross-section of an injection nozzle, and a sectioned injection valve with its spray chamber. A designer might take from them the clean, labelled line-diagram style of technical instruction drawings.
