Some notes on the numerical solution of shear-lag and mathematically related problems
A 1939 NASA technical report on numerical methods for shear-lag and related structural problems, issued for engineers and aeronautical researchers. Its line drawings show engineering diagrams: a vertical column of length L under load P with flange areas labelled, a tilted member with a pivot and dimension b', and a spring-supported bar with a small deflection marked gamma, all rendered in plain black linework on white that a designer could borrow for technical diagram motifs.
