The Effects of Fuel and Cylinder Gas Densities on the Characteristics of Fuel Sprays for Oil Engines
This is a 1928 NASA technical report on how fuel and cylinder gas density change the spray of liquid fuels in oil engines, written for engine researchers. The pictures are plain scientific photographs and charts: spray plumes photographed in a strip and a line graph of spray angle, penetration and distribution against fuel specific gravity. A designer could take from them the stark, grainy look of high-speed spray photography and the clean technical line-chart style of the period.
