Local instability of columns with I-, Z-, channel, and rectangular-tube sections
This is a 1939 NASA technical report on the local instability of aircraft-style columns, issued by the National Advisory Committee for Aeronautics for engineers and structural designers. The pictures are engineering graphs of minimum stress coefficients against width-to-thickness ratios for I-, Z-, channel and rectangular-tube sections, plus cross-section diagrams showing how a column's profile twists or bends under load. A designer might borrow the clean grid-plot style and the simple line-drawn section sketches for diagrams.
