Preliminary Fatigue Studies on Aluminum Alloy Aircraft Engines
A 1938 National Advisory Committee for Aeronautics technical note on preliminary fatigue studies of aluminum alloy aircraft engine parts, issued for engineers and researchers. The pictures are plain black-and-white photographs of test specimens and laboratory rigs, with close views of cracks around bolt holes and a fatigue testing machine with a long beam and clamps. A designer could take from them the look of raw mid-century engineering documentation: grainy metal surfaces, rivet and bolt detail, and cluttered workshop settings.
