Experiments on the Distribution of Fuel in Fuel Sprays
This is a 1932 NACA technical report, issued by the National Advisory Committee for Aeronautics, on experiments measuring how fuel spreads through sprays from diesel-type injectors. Its pictures are photographs of spray jets, shot as side-lit exposures against dark backgrounds, with scale rulings and captions. A designer could take from them the plume shapes of fuel jets as clouds of pale vapour rising from dark fields, with spacing and sequence visible in the series of frames.
