Effects of Air-Fuel Spray and Flame Formation in a Compression-Ignition Engine
A 1937 NASA technical report on air-fuel spray and flame formation in a compression-ignition engine, issued for engineers studying diesel combustion. Its pictures are rows of high-speed photographs of the combustion chamber at successive crank angles around top dead center, with the air-fuel ratio labelled down the left side, each row a sequence of dark frames with bright flame-spray patterns in white against black.
