Carbureting conditions characteristics of aircraft engines
A 1920 technical report on carburetor and fuel behaviour in aircraft engines, issued through NASA's technical reports server for engineers and researchers. Its three pictures are plain engineering line charts: one plots brake mean effective pressure against ratio curves with three labelled traces, another shows altitude curves and a fractional distillation curve on a grid, and the last compares percent mixture enrichment across several carburettors at 1500 r.p.m. A designer could take the sparse, grid-based chart layout, labelled curve keys and restrained two-tone linework as a model for clear technical data graphics.
