Performance of a Compression-ignition Engine with a Precombustion Chamber Having High-Velocity Air Flow
This is a 1931 NACA technical note, published by the National Advisory Committee for Aeronautics in the United States, reporting engine research for aviation and engineering specialists. Its pictures are plain black-and-white technical drawings and photographs: a sectioned fuel-injection valve with a single-orifice nozzle, a set of performance curves plotted against valve position, and a photograph of a single-cylinder research engine on its test stand. A designer might take from them the clean, labelled style of early engineering documentation, with dense line hatching, grid-plotted charts and ruled annotations.
