Increasing the Strength of Aluminum-alloy Columns by Prestressing
A 1937 NACA technical note on strengthening aluminum-alloy columns by prestressing, issued by the National Advisory Committee for Aeronautics for aircraft engineers and researchers. Its single plate is a photograph of an aluminum-alloy tube clamped in a vertical test frame with cross-bars and cables, captioned Fig. 1 and set in a plain typewritten layout that suggests the engineering report genre, useful for a designer seeking stark industrial test-rig imagery.
