The Fundamental Principles of High-speed Semi-diesel Engines. Part III: a Discussion of Fuel Mixing and Ignition, with Special Reference to Engines with Precombustion Chambers
This is a 1926 NACA technical memorandum, issued by the National Advisory Committee for Aeronautics, on high-speed semi-diesel engines and fuel mixing and ignition in engines with precombustion chambers. Its pictures are engineering cross-sections of combustion chambers, valves and injector heads, labelled with figure numbers and makers' names. A designer could draw on their dense, hatched line work for technical diagrams, mechanical schematics or textured linework.
