The Influence of Notches Under Static Stress
This is a 1938 NASA technical report on how notches and drilled holes weaken metal under static load, compiled for engineers and researchers in the aeronautics field. Its pictures are plain engineering graphs of strength against hole diameter and hole spacing, plus photographs of fractured test specimens with rough, grainy surfaces; a designer might take the clean chart styling and the stark specimen photographs as reference for technical diagrams or industrial textures.
