The relative performance obtained with several methods of control of an overcompressed engine using gasoline
This is a 1928 NASA technical report, published in the US, that tests how an engine running on gasoline performs under several ways of controlling overcompression, aimed at engineers and researchers. Its pictures are dense black-and-white line graphs with labelled curves, grids and axis scales plotting fuel consumption, explosion pressure, cooling water loss and valve timing against compression ratio and ignition advance, which a designer might take as a model for clean technical chart layouts with stepped grids and annotated curves.
