Combustion of Gaseous Mixtures
A 1932 NACA technical memorandum, Combustion of Gaseous Mixtures, issued by the National Advisory Committee for Aeronautics for engineers and researchers. Its plates are plain photographs of tall, vertical dark streaks on pale grounds, numbered in Roman numerals and arranged in groups across the sheets. For a designer, the value lies in their abstract texture: soft smoky gradients, vertical bands, and blurred flame-like tails that suggest motion or heat.
